Timeline of events in 2013 Boston Marathon bombing

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Dzhokhar Tsarnaev Found Guilty on Boston Bombing Charges

A timeline of events related to the Boston Marathon bombing, which killed three people and injured 260 others on April 15, 2013. A federal jury on Wednesday convicted Dzhokhar Tsarnaev, who defenders say was influenced by his older brother, Tamerlan.

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March 2011: Russian FSB intelligence security service gives FBI information that Tamerlan Tsarnaev, of Cambridge, Massachusetts, is a follower of radical Islam.

June 2011: FBI closes investigation after finding nothing to link Tamerlan Tsarnaev to terrorism.

Sept. 12, 2011: Bodies of three men are found in Waltham, Massachusetts, with their throats slit and marijuana sprinkled over them.

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Timeline of events in 2013 Boston Marathon bombing
In this courtroom sketch, Boston Marathon bomber Dzhokhar Tsarnaev stands with his defense attorneys as a death by lethal injection sentence is read at the Moakley Federal court house in the penalty phase of his trial in Boston, Friday, May 15, 2015. The federal jury ruled that the 21-year-old Tsarnaev should be sentenced to death for his role in the deadly 2013 attack. (Jane Flavell Collins via AP)
FILE - This file photo released Friday, April 19, 2013 by the Federal Bureau of Investigation shows Boston Marathon bombing suspect Dzhokhar Tsarnaev, charged with carrying out the April 2013 attack that killed three people and injured more than 260. Tsarnaev faces a possible death penalty sentence if convicted in his federal court trial in Boston. The process of finding “death qualified” jurors slowed down jury selection. In the Tsarnaev case, 1,373 people filled out juror questionnaires and individual questioning of prospective jurors has been slowed as the judge has probed people at length about their feelings on the death penalty. (AP Photo/Federal Bureau of Investigation, File)
In this courtroom sketch, Boston Marathon bomber Dzhokhar Tsarnaev stands as a death by lethal injection sentence is read at the Moakley Federal court house in the penalty phase of his trial in Boston, Friday, May 15, 2015. The federal jury ruled that the 21-year-old Tsarnaev should be sentenced to death for his role in the deadly 2013 attack. (Jane Flavell Collins via AP)
In this courtroom sketch, Boston Marathon bomber Dzhokhar Tsarnaev arrives in the courtroom at the Moakley Federal court house in the penalty phase of his trial in Boston, Friday, May 15, 2015. The federal jury ruled that the 21-year-old Tsarnaev should be sentenced to death for his role in the deadly 2013 attack. (Jane Flavell Collins via AP)
Boston Police commissioner William Evans addresses the media after the verdict in the penalty phase of the trial of Boston Marathon bomber Dzhokhar Tsarnaev, Friday, May 15, 2015. Evans said that Tsarnaev's actions of planting a bomb behind the Martin family on the afternoon of the race were diabolical. The federal jury ruled that the 21-year-old Tsarnaev should be sentenced to death by lethal injection for his role in the deadly 2013 attack. (AP Photo/Charles Krupa)
Karen Snyder, right, and Kathryn Vanwie react to the announcement of the death penalty verdict for Dzhokhar Tsarnaev outside the John Joseph Moakley United States Courthouse Friday, May 15, 2015, in Boston. Tsarnaev was charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured 260 spectators in April 2013. Both women felt the verdict was fair. (AP Photo/Stephan Savoia)
Carmen M. Ortiz, U.S. attorney for the District of Massachusetts, surrounded by law enforcement officials, speaks to members of the media after the death penalty verdict for Dzhokhar Tsarnaev, outside the U.S. courthouse Friday May 15, 2015, in Boston. Three people were killed and more than 260 wounded when Tsarnaev and his brother set off two shrapnel-packed pressure-cooker bombs near the finish line of the race on April 15, 2013. The Tsarnaevs also shot an MIT police officer to death during their getaway. (AP Photo/Stephan Savoia)
A U.S. Marshal instructs Dept. of Homeland Security officers outside the Moakley Federal Court in Boston, Friday, May 15, 2015, after the U.S. Attorney's office announced that there was a verdict in the penalty phase of the trial of Boston Marathon bomber Dzhokhar Tsarnaev. The federal jury must decide whether the 21-year-old Tsarnaev should be sentenced to death or life in prison for his role in the deadly attack in 2013. (AP Photo/Charles Krupa)
BOSTON, MA - MAY 13: TV cameras line the entrance of John Joseph Moakley United States Courthouse as the Boston Bomber Trial enters jury deliberations in the sentencing phase of the trail on May 13, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev was found guilty on all 30 counts related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
BOSTON, MA - MAY 13: Members of the legal defense team for Boston Marathon bombing suspect Dzhokhar Tsarnaev, including William Fick (from left), Miriam Conrad, Judy Clarke and Timothy Watkins leave John Joseph Moakley United States Courthouse after the beginning of jury deliberations in the sentencing phase of the Boston Bomber Trial on May 13, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev was found guilty on all 30 counts related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
BOSTON, MA - MAY 13: Members of the public line up to enter John Joseph Moakley United States Courthouse as the Boston Bomber Trial is slated to start closing arguments on May 13, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev was found guilty on all 30 counts related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
BOSTON, MA - MAY 11: A protester holds up a sign outside of John Joseph Moakley United States Courthouse as the Tsarnaev defense nears its end of presenting case in sentencing phase of the Boston Bomber Trial on May 11, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev, 21, was found guilty on all 30 counts related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
BOSTON, MA - MAY 11: Sister Helen Prejean is surrounded by media after testifying at John Joseph Moakley United States Courthouse as the Tsarnaev defense nears its end of presenting case in sentencing phase of the Boston Bomber Trial on May 11, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev, 21, was found guilty on all 30 counts related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
In this courtroom sketch, Assistant U.S. Attorney Aloke Chakravarty is depicted pointing to defendant Dzhokhar Tsarnaev, right, during closing arguments in Tsarnaev's federal death penalty trial Monday, April 6, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Jane Flavell Collins)
Nabisat Suleimanova, a cousin of Dzhokhar Tsarnaev, leaves federal court in Boston after testifying Monday, May 4, 2015, during the penalty phase in Tsarnaev's trial. Tsarnaev was convicted of the Boston Marathon bombings that killed three and injured more than 260 people in April 2013. (AP Photo/Steven Senne)
A car carrying some relatives of Dzhokhar Tsarnaev leaves federal court in Boston after testifying Monday, May 4, 2015, during the penalty phase in Tsarnaev's trial. Tsarnaev was convicted of the Boston Marathon bombings that killed three and injured more than 260 people in April 2013. (AP Photo/Elise Amendola)
A relative of Dzhokhar Tsarnaev leaves federal court in Boston after testifying Monday, May 4, 2015, during the penalty phase in Tsarnaev's trial. Tsarnaev was convicted of the Boston Marathon bombings that killed three and injured more than 260 people in April 2013. (AP Photo/Steven Senne)
BOSTON, MA - MAY 04: Members of the legal defense team for Boston Marathon bombing suspect Dzhokhar Tsarnaev, including Miriam Conrad, (from left), Judy Clarke and David Bruck arrive at John Joseph Moakley United States Courthouse as the sentencing phase in the Boston Bomber Trial continues on May 4, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev, 21, was found guilty on all 30 counts related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries and his relatives are expected to take the stand to testify. (Photo by Scott Eisen/Getty Images)
In this courtroom sketch, Shakhruzat Suleimanova, right, an aunt of Dzhokhar Tsarnaev, is depicted alongside an interpreter as she testifies during the penalty phase in the Tsarnaev's trial Monday, May 4, 2015, in federal court in Boston. Tsarnaev was convicted in the Boston Marathon bombings that killed three and injured 260 people in April 2013. (Jane Flavell Collins via AP)
In this courtroom sketch, Raisat Suleimanova, right, is depicted testifying alongside an interpreter during the penalty phase in the trial of her cousin Dzhokhar Tsarnaev, center, Monday, May 4, 2015, in federal court in Boston. Tsarnaev was convicted of the Boston Marathon bombings that killed three and injured 260 people in April 2013. (Jane Flavell Collins via AP)
Members of the legal defense team for Boston Marathon bombing suspect Dzhokhar Tsarnaev, including (L-R) David Bruck, Timothy G. Watkins and Judy Clarke leave John Joseph Moakley United States Courthouse as the sentencing phase In Boston Bomber Trial continues on April 27, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev, 21, was found guilty on all 30 counts related to to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
Members of the legal defense team for Boston Marathon bombing suspect Dzhokhar Tsarnaev, including William Fick (L) and Timothy G. Watkins walk away from John Joseph Moakley United States Courthouse during the first day of the sentencing phase of the Boston Marathon Bomber Trial on April 21, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev, 21, was found guilty on all 30 counts related to to his involvement in the 2013 bombing, which related in three deaths and over 250 injuries.(Photo by Scott Eisen/Getty Images)
Death penalty protesters stand outside federal court, Monday, April 27, 2015, in Boston, during the penalty phase of the federal trial of Dzhokhar Tsarnaev, who was convicted of the Boston Marathon bombings that killed three and injured 260 people in April 2013. (AP Photo/Justin Saglio)
Death penalty protesters stand outside federal court, Monday, April 27, 2015, in Boston, during the penalty phase of the federal trial of Dzhokhar Tsarnaev, who was convicted of the Boston Marathon bombings that killed three and injured 260 people in April 2013. (AP Photo/Justin Saglio)
BOSTON, MA - APRIL 21: Media and police vechicles are reflected in the entranceway of John Joseph Moakley United States Courthouse during the first day of the sentencing phase of the Boston Marathon Bomber Trial on April 21, 2015 in Boston, Massachusetts. Dzhokar Tsarnaev, 21, was found guilty on all 30 counts related to to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
Federal prosecutor William D. Weinreb arrives at federal court, Monday, April 27, 2015, in Boston, during the penalty phase of the federal trial of Dzhokhar Tsarnaev, who was convicted of the Boston Marathon bombings that killed three and injured 260 people in April 2013. (AP Photo/Justin Saglio)
BOSTON - APRIL 8: The jury found Dzhokhar Tsarnaev guilty at the Boston Marathon bombing trial at Moakley Federal Court. Bombing survivor Karen Brassard pauses as she answers a question outside the courthouse after the verdict. (Photo by John Tlumacki/The Boston Globe via Getty Images)
BOSTON, MA - APRIL 8: Dana Cohen, (from left), Carlos Arredondo, Karen Brassard, Liz Norden, Laurie Scher and Massport Fire Lt. Michael Ward at a press conference outside of John Joseph Moakley United States Courthouse following a verdict in the Marathon Bombing case on on April 8, 2015 in Boston, Massachusetts. Dzhokhar Tsarnaev, 21, was found guilty on all 30 counts related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images)
In this courtroom sketch, Boston Marathon bombing survivor Celeste Corcoran is depicted on the witness stand during the first day of the penalty phase in the trial of Boston Marathon bomber Dzhokhar Tsarnaev, Tuesday, April 21, 2015, in federal court in Boston. Corcoran lost both legs below the knee in the first explosion near the marathon finish line in 2013. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, William Campbell, Jr., father of Boston Marathon bombing victim Krystle Campbell, is depicted on the witness stand during the first day of the penalty phase in the trial of Boston Marathon bomber Dzhokhar Tsarnaev, Tuesday, April 21, 2015, in federal court in Boston. Krystle Campbell was one of three who died after two bombs went off near the marathon finish line in 2013. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, defense attorney Judy Clarke is depicted addressing the jury as defendant Dzhokhar Tsarnaev, right, sits during closing arguments in Tsarnaev's federal death penalty trial Monday, April 6, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring more than 260 people. (AP Photo/Jane Flavell Collins)
FILE - This combination of undated family photos shows, from left, Martin Richard, 8, Krystle Campbell, 29, and Lu Lingzi, a Boston University graduate student from China. Richard, Campbell and Lu were killed in the bombings near the finish line of the Boston Marathon on April 15, 2013, in Boston. (AP Photo/File)
FILE - This undated file photo released by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, of Somerville, Mass. Investigators said Collier was shot to death Thursday, April 18, 2013 on the school's campus in Cambridge, Mass., by Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev in a botched attempt to obtain his gun several days after the twin explosions. During testimony Wednesday, March 11, 2015, in the federal death penalty trial in Boston of Dzhokhar Tsarnaev, MIT Police Chief John DiFava testified he told Collier to "be safe" about an hour before he was shot dead. Prosecutors said the Tsarnaev brothers killed Collier during an unsuccessful attempt to steal his gun. Dzhokhar Tsarnaev's lawyer said during opening statements that it was Tamerlan Tsarnaev who shot Collier.(AP Photo/Middlesex District Attorney's Office, File)
In this courtroom sketch, defense attorney Judy Clarke is depicted addressing the jury as defendant Dzhokhar Tsarnaev, right, sits during closing arguments in Tsarnaev's federal death penalty trial Monday, April 6, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring more than 260 people. (AP Photo/Jane Flavell Collins)
FILE - In this March 5, 2015 file courtroom sketch, Dzhokhar Tsarnaev, center, is depicted between defense attorneys Miriam Conrad, left, and Judy Clarke, right, during his federal death penalty trial in Boston. Prosecutors rested their case against Tsarnaev on Monday, March 30, 2015, after jurors saw gruesome autopsy photos and heard a medical examiner describe the devastating injuries suffered by the three people who died in the 2013 terror attack. (AP Photo/Jane Flavell Collins, File)
This undated forensics photograph provided by the U.S. Attorney's office and presented as evidence during the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev Tuesday, March 10, 2015, in Boston, shows handwriting on the bullet-riddled, blood-stained wall of a boat. The prosecution presented the photo as evidence of the handwritten note found inside the boat where Tsarnaev was captured April 19, 2013 in Watertown, Mass., four days after the bombings. (AP Photo/U.S. Attorney's Office)
Wood from the power boat where Dzhokhar Tsarnaev was found hiding, etched with many words including "killing our people", is displayed in a conference room at the John Joseph Moakley United States Courthouse in Boston, Tuesday, March 17, 2015. The wooden pieces were presented to a jury in Tsarnaev's federal death penalty trial. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured 260 spectators in April 2013. (AP Photo/Charles Krupa)
A Ruger pistol, that was shown during the Dzhokhar Tsarnaev federal death penalty trial, is displayed at a conference room at the John Joseph Moakley United States Courthouse in Boston, Tuesday, March 17, 2015. Stephen Silva said during testimony Tuesday that he loaned Tsarnaev a P95 Ruger pistol in February 2013. Authorities say the P-95 Ruger was the gun used to kill MIT police officer Sean Collier. (AP Photo/Charles Krupa)
This undated forensics photograph made by the FBI, provided by the U.S. Attorney's office and presented as evidence during the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev Tuesday, March 10, 2015, in Boston, shows handwriting on the bullet-riddled, blood-stained wall of a boat. The prosecution presented the photo as evidence of the handwritten note found inside the boat where Tsarnaev was captured April 19, 2013 in Watertown, Mass., four days after the bombings. (AP Photo/U.S. Attorney's Office)
This undated forensics photograph provided by the U.S. Attorney's office and presented as evidence during the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev Tuesday, March 10, 2015, in Boston, shows handwriting on the bullet-riddled, blood-stained wall of a boat. The prosecution presented the photo as evidence of the handwritten note found inside the boat where Tsarnaev was captured April 19, 2013 in Watertown, Mass., four days after the bombings. (AP Photo/U.S. Attorney's Office)
This undated forensics photograph released by the U.S. Attorney's office and presented as evidence during the federal death penalty trial of Dzhokhar Tsarnaev, Wednesday March 11, 2015, in Boston, shows a bloodied service pistol sitting on the seat of MIT Police Officer Sean Collier's cruiser. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured more than 260 spectators in April 2013. (AP Photo/U.S. Attorney's Office)
A smashed iPhone is displayed in a conference room at the John Joseph Moakley United States Courthouse in Boston, Tuesday, March 17, 2015. The cell phone and other objects were presented to a jury during Dzhokhar Tsarnaev's federal death penalty trial. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured 260 spectators in April 2013. (AP Photo/Charles Krupa)
FILE - In this Friday, April 19, 2013 file photo provided by the Massachusetts State Police, 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev leans over in a boat at the time of his capture by law enforcement authorities in Watertown, Mass. Tsarnaev has pleaded not guilty in the April 15, 2013, Boston Marathon bombing, which killed three people and injured more than 260 others. His brother, Tamerlan Tsarnaev, died following a shootout with police. The Boston Marathon bombing has been selected the sports story of the year in an annual vote conducted by The Associated Press. (AP Photo/Massachusetts State Police, Sean Murphy, File)
In this courtroom sketch, the boat in which Dzhokhar Tsarnaev was captured is depicted on a trailer for observation during Tsarnaev's federal death penalty trial Monday, March 16, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring more than 260 people. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, Dzhokhar Tsarnaev, center seated, is depicted between defense attorneys while the boat in which he was captured in sits on a trailer for observation during his federal death penalty trial, Monday, March 16, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring more than 260 people. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, Dzhokhar Tsarnaev, center, is depicted between defense attorneys Miriam Conrad, left, and Judy Clarke, right, during his federal death penalty trial, Thursday, March 5, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Jane Flavell Collins)
BOSTON - MARCH 9: An artist's sketch of Dzhokhar Tsarnaev hangs on the wall outside the Moakley courthouse for videographers to record during the Marathon bombing trial. (Photo by Lane Turner/The Boston Globe via Getty Images)
BOSTON - MARCH 11: Members of the media film evidence from the Dzhokhar Tsarnaev Boston Marathon bombing trial on display at the Moakley Federal Courthouse in Boston on March 11, 2015 . (Photo by John Blanding/The Boston Globe via Getty Images)
A portion of a pressure-cooker bomb recovered from a blast site at the Boston Marathon bombing is displayed for the media in a conference room after the conclusion of the day's session at the Dzhokhar Tsarnaev federal death penalty trial at the John Joseph Moakley United States Courthouse in Boston, Wednesday, March 11, 2015. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured more than 260 spectators in April 2013. (AP Photo/Charles Krupa)
A damaged yellow jacket, worn by Boston Marathon bombing survivor Jessica Kensky during the blast, is displayed to the media along side a can containing remnants of a bomb in a conference room after the conclusion of the day's session at the Dzhokhar Tsarnaev federal death penalty trial at the John Joseph Moakley United States Courthouse in Boston, Wednesday, March 11, 2015. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured more than 260 spectators in April 2013. (AP Photo/Charles Krupa)
A damaged white jersey, worn by Boston Marathon bombing survivor Jessica Kensky during the blast, is displayed to the media in a conference room after the conclusion of the day's session at the Dzhokhar Tsarnaev federal death penalty trial at the John Joseph Moakley United States Courthouse in Boston, Wednesday, March 11, 2015. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured more than 260 spectators in April 2013. (AP Photo/Charles Krupa)
In this courtroom sketch, Dun Meng, far right, testifies with a translator at his side during the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev in Boston, Thursday, March 12, 2015. Meng described his harrowing ride at gunpoint with the Boston Marathon bombers and the moment he made "the most difficult decision" of his life to bolt from the car. Tsarnaev is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring more than 260 people. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, Boston Marathon bombing survivor Jeff Bauman is depicted while testifying in the federal death penalty trial of Dzhokhar Tsarnaev Thursday, March 5, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring 260 people. Bauman lost both legs in one of the blasts. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, Bill Richard, right, is depicted while testifying during the federal death penalty trial of Dzhokhar Tsarnaev, second from left, Thursday, March 5, 2015, in Boston. Tsarnaev is depicted sitting between defense attorneys Judy Clarke, left, and Miriam Conrad, second from right, as U.S. District Judge George O'Toole Jr., presides, center rear. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three spectators, including Bill Richard's son Martin Richard. (AP Photo/Jane Flavell Collins)
It this courtroom sketch, U.S. Attorney William Weinreb, left, is depicted delivering opening statements in front of U.S. District Judge George O'Toole Jr., right rear, on the first day of the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev, Wednesday, March 4, 2015, in Boston. Tsarnaev, depicted seated second from right between defense attorneys Judy Clarke, third from right, and Miriam Conrad, right, is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, defense attorney Judy Clarke is depicted delivering opening statements in front of U.S. District Judge George O'Toole Jr., on the first day of the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev, Wednesday, March 4, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Jane Flavell Collins)
Graphic shows the area of Mass. jurors where called from and the final number chosen relative to the initial number summoned.; 2c x 2 1/2 inches; 96.3 mm x 63 mm;
BOSTON - MARCH 4: Opening statements in the trial of the Boston Marathon bomber took place at Moakley Federal Courthouse. A construction crew lowers a form to pour concrete in with the words 'Boston Strong' spray painted on it at a construction site directly across from the courthouse. (Photo by John Tlumacki/The Boston Globe via Getty Images)
Boston Marathon bombing survivor Marc Fucarile, center, and his wife Jennifer, left, leave federal court, Wednesday, March 4, 2015, in Boston, on the first day of the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev. Tsarnaev is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring 260 people. Fucarile lost his right leg in one of the explosions. (AP Photo/Michael Dwyer)
Boston Marathon bombing survivors Heather Abbott, left, and Karen Rand, center, are escorted from federal court, Wednesday, March 4, 2015, in Boston, after the first day of the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev. Tsarnaev is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Michael Dwyer)
A police officer and his dog patrol outside federal court, Wednesday, March 4, 2015, in Boston, on the first day of the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev. Tsarnaev is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Michael Dwyer)
BOSTON - MARCH 5: Boston Marathon bombing victim, Rebekah Gregory, right, arrived at Moakley Federal Courthouse in Boston, where the second day in the trial of Dzhokhar Tsarnaev got underway on March 5, 2015. (Photo by Wendy Maeda/The Boston Globe via Getty Images)
BOSTON, MA - MARCH 4: Joe Kebartas of South Boston protests the death penalty outside of the entrance to the John Joseph Moakley United States Courthouse during the first day of the Dzhokhar Tsarnaev trial on March 4, 2015 in Boston, Massachusetts. Dzhokhar Tsarnaev is charged with using a weapon of mass destruction in an attack on the April 15, 2013 Boston Marathon along with his brother Tamerlan, who was later killed during a shootout with police. (Photo by Scott Eisen/Getty Images)
BOSTON - MARCH 4: Jose Briceno, of Cambridge, Mass., protests outside Moakley Federal Courthouse, where opening statements began in the trial of Dzhokhar Tsarnaev on March 4, 2015. (Photo by Wendy Maeda/The Boston Globe via Getty Images)
Boston police officers patrol outside federal court, Wednesday, March 4, 2015, in Boston, on the first day of the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev. Tsarnaev is charged with conspiring with his brother to place two bombs near the marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Michael Dwyer)
A woman disembarks a bus that shuttled Boston Marathon bombing survivors to federal court, Wednesday, March 4, 2015, in Boston, on the first day of the federal death penalty trial of bombing suspect Dzhokhar Tsarnaev. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Michael Dwyer)
Boston Marathon bombing survivor Heather Abbott is helped from a bus outside federal court, Wednesday, March 4, 2015, in Boston, on the first day of the federal death penalty trial of bombing suspect Dzhokhar Tsarnaev. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Michael Dwyer)
In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev, third from right, is depicted with his lawyers and U.S. District Judge George O'Toole Jr., right, as O'Toole addresses a pool of potential jurors in a jury assembly room at the federal courthouse, Tuesday, Jan. 6, 2015, in Boston. Tsarnaev is charged with the April 2013 attack that killed three people and injured more than 260. His trial is scheduled to begin on Jan. 26. He could face the death penalty if convicted. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev, third from right, is depicted with his lawyers and U.S. District Judge George O'Toole Jr., right, as O'Toole addresses a pool of potential jurors in a jury assembly room at the federal courthouse, Tuesday, Jan. 6, 2015, in Boston. Tsarnaev is charged with the April 2013 attack that killed three people and injured more than 260. His trial is scheduled to begin on Jan. 26. He could face the death penalty if convicted. (AP Photo/Jane Flavell Collins)
FILE - In this Monday, Jan. 5, 2015 file courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev, left, is depicted beside U.S. District Judge George O'Toole Jr., right, as O'Toole addresses a pool of potential jurors in a jury assembly room at the federal courthouse, in Boston. Two highly anticipated criminal trials are underway almost simultaneously in Massachusetts: the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev and the murder trial of former New England Patriots star Aaron Hernandez. (AP Photo/Jane Flavell Collins, File)
In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev, second from right, is depicted with his lawyers, left, beside U.S. District Judge George O'Toole Jr., right, as O'Toole addresses a pool of potential jurors in a jury assembly room at the federal courthouse, Monday, Jan. 5, 2015, in Boston. Tsarnaev is charged with the April 2013 attack that killed three people and injured more than 260. His trial is scheduled to begin on Jan. 26. He could face the death penalty if convicted. (AP Photo/Jane Flavell Collins)
FILE - In this Monday, Jan. 5, 2015, file courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev, left, is depicted beside U.S. District Judge George O'Toole Jr., right, as O'Toole addresses a pool of potential jurors in a jury assembly room at the federal courthouse, in Boston. Lawyers for Boston Marathon bombing suspect Dzhokhar Tsarnaev asked a judge on Tuesday, Jan. 13, to suspend jury selection in his trial for at least a month because the recent terrorist attacks in France have again placed the marathon bombings "at the center of a grim global drama." (AP Photo/Jane Flavell Collins, File)
In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev, second from right, is depicted with his lawyers, left, beside U.S. District Judge George O'Toole Jr., right, as O'Toole addresses a pool of potential jurors in a jury assembly room at the federal courthouse, Monday, Jan. 5, 2015, in Boston. Tsarnaev is charged with the April 2013 attack that killed three people and injured more than 260. His trial is scheduled to begin on Jan. 26. He could face the death penalty if convicted. (AP Photo/Jane Flavell Collins)
In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev is depicted sitting in federal court in Boston Thursday, Dec. 18, 2014, for a final hearing before his trial begins in January. Tsarnaev is charged with the April 2013 attack that killed three people and injured more than 260. He could face the death penalty if convicted. (AP Photo/Jane Flavell Collins)
This courtroom sketch depicts Boston Marathon bombing suspect Dzhokhar Tsarnaev standing with his lawyer Miriam Conrad, left, before Magistrate Judge Marianne Bowler, right, during his arraignment in federal court Wednesday, July 10, 2013 in Boston. The 19-year-old has been charged with using a weapon of mass destruction, and could face the death penalty. (AP Photo/Jane Flavell Collins)
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Late 2011: U.S. officials add the Tsarnaevs' mother to a federal terrorism database after Russia contacts CIA with concerns they were religious militants about to travel to Russia. She later says she has no links to terrorism.

January 2012: Tamerlan arrives in Russia, where he spends time in two predominantly Muslim provinces, Dagestan and Chechnya.

July 2012: Officials in Dagestan say Tamerlan applies for a new passport but never picks it up. Russian officials say they have him under surveillance but lose track of him after the death of a Canadian man who had joined an Islamic insurgency in the region.

July 17, 2012: Tamerlan returns to U.S.

November 2012: Islamic Society of Boston Cultural Center in Cambridge says Tamerlan has an outburst that interrupts a sermon about it being acceptable for Muslims to celebrate American holidays.

January 2013: Islamic Society says Tamerlan has a second outburst after a sermon that includes praise for the Rev. Martin Luther King Jr.

April 15, 2013: Bombs go off at the finish line of the Boston Marathon, killing three people and injuring more than 260 others.

April 16, 2013: Federal agents say the bombs were made from pressure cookers packed with explosives, nails and other shrapnel, but they still don't know who detonated them or why.

April 17, 2013: President Barack Obama signs emergency declaration for Massachusetts and orders federal aid to supplement local response.

April 18, 2013: Investigators release photos and video of two suspects and ask for public's help identifying them. Later that night, Massachusetts Institute of Technology police officer Sean Collier is shot to death in his cruiser by Tamerlan and Dzhokhar Tsarnaev. They steal an SUV at gunpoint from a Cambridge gas station. The driver is held for about a half-hour, then released unharmed.

April 19, 2013: Tsarnaevs have an early morning gunbattle with authorities who have tracked them to Watertown. Tamerlan, who is run over by his younger brother, dies. Dzhokhar escapes, and at around 6 a.m., authorities tell residents of Boston and surrounding communities to stay indoors. All mass transit is shut down. That order is lifted around 6:30 p.m., just before authorities trace Dzhokhar to a Watertown backyard, where he is found hiding in a boat and taken into custody.

April 22, 2013: Dzhokhar Tsarnaev, injured in the shootout, is charged in his hospital room with using and conspiring to use a weapon of mass destruction.

April 30, 2013: Two friends of Dzhokhar's are charged with attempting to destroy evidence by disposing of a backpack and laptop computer taken from his room after they found he was a suspect in the bombing. Another is charged with lying to investigators.

May 9, 2013: Tamerlan Tsarnaev is secretly buried in Virginia after a weeklong search for a cemetery willing to take the body.

May 22, 2013: An FBI agent in Orlando, Florida, fatally shoots Ibragim Todashev, a friend of Tamerlan's, after he lunges at law enforcement officials questioning him about the Waltham killings. Officials say that before he died, he had agreed to give a statement about his involvement.

July 10, 2013: Dzhokhar Tsarnaev pleads not guilty to 30 federal charges.

July 23, 2013: Marc Fucarile is the last survivor of the bombings to leave the hospital.

Jan. 30, 2014: Prosecutors announce they will seek the death penalty against Dzhokhar.

April 15, 2014: Ceremonies and events mark the anniversary of the attacks.

April 21, 2014: The 2014 Boston Marathon features a field of 36,000 runners, 9,000 more than 2013 and the second-biggest field in history.

May 30, 2014: Khairullozhon Matanov, 23, of Quincy, is arrested on charges of obstructing the investigation by deleting information from his computer and lying to investigators.

June 18, 2014: Tsarnaev's lawyers file first of several requests to move the trial to Washington, D.C.

July 21, 2014: Azamat Tazhayakov, a college friend of Dzhokhar's, is convicted of obstruction of justice and conspiracy for agreeing with another friend to get rid of a backpack and disabled fireworks they took from his dorm room three days after the attack.

July 22, 2014: Stephen Silva, believed to have provided the gun used by the Tsarnaevs to kill Collier, is arrested on drug and weapons charges.

Aug. 22, 2014: Dias Kadyrbayev, 20, pleads guilty to impeding the investigation by removing incriminating evidence from Dzhokhar's dorm room.

Sept. 24, 2014: Judge grants delay and pushes start of trial to Jan. 5, 2015.

Oct. 28, 2014: Robel Phillipos, 21, of Cambridge, is convicted of lying to federal agents about being in Dzhokhar's room.

Nov. 25, 2014: Federal judge rejects a request from lawyers for Tsarnaev to order prosecutors to turn over evidence about his older brother's possible participation in the Waltham slayings.

Dec. 18, 2014: Tsarnaev appears in court for first time since his July 2013 arraignment.

Jan. 5, 2015: Jury selection begins in Tsarnaev's trial.

March 4, 2015: Tsarnaev's lead defense attorney, Judy Clarke, declares in opening statements: "It was him."

April 6, 2015: Prosecutors and defense present closing statements.

April 7, 2015: Jury begins deliberating verdicts.

April 8, 2015: Jury convicts Tsarnaev; will weigh possible death sentence in forthcoming penalty phase of trial.

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