Playground honors MIT officer slain by marathon bombers

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MIT To Dedicate Permanent Memorial To Officer Sean Collier

WILMINGTON, Mass. (AP) -- A playground named in honor of the Massachusetts Institute of Technology police officer killed by the Boston Marathon bombers has opened.

The playground was dedicated to Sean Collier in Wilmington on Saturday. Collier's cousins cut the ribbon to officially open the park.

More tributes for Sean Collier in the gallery below:

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Sean Collier
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Playground honors MIT officer slain by marathon bombers
A woman lays a rose on the Collier Memorial at the Massachusetts Institute of Technology in Cambridge, Mass., Wednesday, April 29, 2015. MIT has dedicated the permanent memorial in honor of campus police Officer Sean Collier, who was slain by the Boston Marathon bombers. (AP Photo/Charles Krupa)
A patch and ribbons are attached to a cross at a makeshift memorial to slain Massachusetts Institute of Technology police officer Sean Collier, on the campus of MIT, Wednesday, July 23, 2014, in Cambridge, Mass. Stephen Silva was arrested Monday, July 21, 2014 on charges of heroin trafficking and possession of a handgun with an obliterated serial number. The same gun was used to kill Collier during a manhunt for the bombing suspects, according to two people with knowledge of the case who spoke to The Associated Press on the condition of anonymity because they were not authorized to discuss the investigation. Silva is a friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev. (AP Photo)
With a rose resting on Collier Memorial, a police officer walks away after paying his respects the Massachusetts Institute of Technology in Cambridge, Mass., Wednesday, April 29, 2015. MIT has dedicated the permanent memorial in honor of campus police Officer Sean Collier, who was slain by the Boston Marathon bombers. (AP Photo/Charles Krupa)
CAMBRIDGE, MA - APRIL 29: Two-year-old cousin of Sean Collier, C.J. Roberts, of Pepperell. Family of slain MIT Police Officer Sean Collier, gather at the newly dedicated memorial. The memorial for Sean Collier, Boston Marathon shooting victim, is dedicated at MIT. (Photo by Suzanne Kreiter/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 29: MIT Police Captain Cheryl Vossmer, hugs students at the newly dedicated memorial. The memorial for Sean Collier, Boston Marathon shooting victim, is dedicated at MIT. (Photo by Suzanne Kreiter/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 29: Roses left behind after the dedication ceremony. The memorial for Sean Collier, Boston Marathon shooting victim, is dedicated at MIT. (Photo by (Photo by Suzanne Kreiter/The Boston Globe via Getty Images) via Getty Images)
CAMBRIDGE, MA - APRIL 29: MIT Police Captain Cheryl Vossmer, hugs students at the newly dedicated memorial. The memorial for Sean Collier, Boston Marathon shooting victim, is dedicated at MIT. (Photo by (Photo by Suzanne Kreiter/The Boston Globe via Getty Images) via Getty Images)
CAMBRIDGE, MA - APRIL 29: Law enforcement officers from all over gathered for the dedication of the memorial for Sean Collier, Boston Marathon shooting victim, at MIT. (Photo by Suzanne Kreiter/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 29: Police cars move past the newly dedicated memorial and MIT police officers salute. The memorial for Sean Collier, Boston Marathon shooting victim, is dedicated at MIT. (Photo by Suzanne Kreiter/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 4: Signs for slain MIT poice officer Sean Collier in the Koch building at MIT. (Photo by Joanne Rathe/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 7: A stone memorial honors Massachusetts Institute of Technology police officer Sean Collier April 7, 2014 in Cambridge, Massachusetts. Collier was killed on the night of April 18, 2013, as he sat in his patrol car in the plaza at the intersection of Vassar and Main Streets, when two suspects in the Boston Marathon bombings attempted to steal his weapon. The two men were later identified as Tamerlan and Dzhokhar Tsarnaev. (Photo by Darren McCollester/Getty Images)
SALEM, MA - MAY 13: The plaque presented to Sean Collier's family. A celebration of life service for alum Sean Collier at Salem State University's central campus on Monday, May 13, 2013. Collier was killed during a shootout with the Boston Marathon bombing suspects on April 18. (Photo by Matthew J. Lee/The Boston Globe via Getty Images)
BOSTON - MAY 21: This bib honoring Officer Sean Collier will be worn on the back of all runners. Organizers and volunteers gathered to prepare packets for runners in Boston's Run to Remember at the World Trade Center in Boston, MA on Tuesday, May 21, 2013. The special bib with Sean Collier's name and his MIT police car number will be worn by runners, but were not put into the packets. (Photo by Yoon S. Byun/The Boston Globe via Getty Images)
BOSTON - MAY 26: Lauren O'Keefe of Boston, wears a homemade Collier #179 tag on her back, in memory of fallen MIT Police Officer Sean Collier. Although O'Keefe did not personally know Sean Collier, she was running in his memory. Runners take to the streets at the start of Boston's Run to Remember. The race is dedicated to law enforcement officers killed in the line of duty. (Photo by Jessica Rinaldi for The Boston Globe via Getty Images)
UNITED STATES - MAY 9: Pictures of Officer Sean Collier, and Martin Richard, 8, victims of the Boston terrorists, appear during testimony by Edward Davis, right, Boston Police Commissioner, during a House Homeland Security Committee hearing in Cannon titled 'The Boston Bombings: A First Look.' Former Sen. Joe Lieberman, I-Conn., appears at left. (Photo By Tom Williams/CQ Roll Call)
BOSTON, MA - APRIL 26: A general view of the memorial to victims of the April 15 Boston Marathon Bombing Sean Collier, Krystle Campbell, Lu Lingzi and Martin Richard on April 26, 2013 in Boston. (Photo by Paul Marotta/Getty Images)
CAMBRIDGE, MA - APRIL 24: A police officer leaves the memorial for slain MIT police officer Sean Collier, held at Briggs Field. Collier was killed by the Boston Marathon bombing suspects. (Photo by Jonathan Wiggs/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 24: Brothers of victim Andrew Collier at right, and Robert, who spoke after Andrew; spoke during the memorial service for MIT police officer Sean Collier, at Briggs Field, on the MIT campus. Collier was killed during a shootout with the Boston Marathon bombing suspects. (Photo by Bill Greene/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 24: A woman carries a program while entering the memorial service for slain Massachusetts Institute of Technology (MIT) police officer Sean Collier on April 24, 2013 in Cambridge, Massachusetts. Collier was allegedly shot by the suspects in the Boston Marathon bombing, Dzhokhar Tsarnaev, 19, and his brother Tamerlan Tsarnaev, 26, after their identities were determined and a manhunt was launched. Tamerlan Tsarnaev was subsequently shot and killed after a car chase and shootout with police and Dzhokhar Tsarnaev was apprehended on a boat parked on a residential property in Watertown, Massachusetts. The bombing, on April 15 at the finish line of the marathon, killed three people and wounded at least 170. (Photo by Mario Tama/Getty Images)
Mourners bow their heads during a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Elise Amendola)
A photograph of fallen Massachusetts Institute of Technology police officer Sean Collier is attached to a cross at a makeshift memorial on the MIT campus, in Cambridge, Mass., Wednesday, April 24, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Steven Senne)
A tribute honoring fallen Massachusetts Institute of Technology police officer Sean Collier is seen on a window of a truck that belonged to Collier as it departs St. Patrick's Church in Stoneham, Mass., following a funeral Mass, Tuesday, April 23, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Steven Senne)
Massachusetts Institute of Technology student Hajar Boughoula of Bizerte, Tunisia, writes a message on the ground with chalk near a makeshift memorial for fallen MIT police officer Sean Collier on the school's campus in Cambridge, Mass., Monday, April 22, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Steven Senne)
FILE - In this April 20, 2013 file photo, the Boston Red Sox line up during a tribute to victims of the Boston Marathon bombing and its aftermath, as an image of MIT Police Officer Sean Collier is displayed on the scoreboard, before a baseball game against the Kansas City Royals in Boston. Collier was dedicated to his work and loved life; to the 27-year-old bachelor, âevery day was a good day,â said Massachusetts Institute of Technology Police Chief John DiFava at a ceremony Friday, Oct. 18, 2013 to unveil a temporary memorial to Collier. The ceremony was held six months to the day of Collierâs death. A moment of silence during a candlelight vigil was scheduled for 10:20 p.m. Friday, the exact time Collier was slain. (AP Photo/Michael Dwyer)
A sign with the photographs of Sean Collier, bottom left, a Massachusetts Institute of Technology officer killed, and Richard Donohue, a Boston Police officer who was shot and critically wounded, is seen at a makeshift memorial on Boylston Street, near the finish line of the Boston Marathon, Saturday, April 20, 2013, in Boston. Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured late Friday evening in Watertown, Mass. (AP Photo/Julio Cortez)
People raise their arms while observing a moment of silence for those killed in Boston Marathon bombings and form a human chain from a makeshift memorial for fallen MIT police officer Sean Collier to a campus police station, at MIT, in Cambridge, Mass., Monday, April 22, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Steven Senne)
CAMBRIDGE, MA - APRIL 24: Rachel Batista sheds a tear while watching police processions, before the start of the memorial for slain MIT police officer Sean Collier at Briggs Field. Collier was killed by the Boston Marathon bombing suspects. (Photo by Jonathan Wiggs/The Boston Globe via Getty Images)
CAMBRIDGE, MA - APRIL 24: A police officer grabs a picture before heading to the memorial for slain MIT police officer Sean Collier at Briggs Field. Collier was killed by the Boston Marathon bombing suspects. (Photo by Jonathan Wiggs/The Boston Globe via Getty Images)
A mourner places an "MIT Strong" pin on her jacket at a one-year remembrance ceremony for Massachusetts Institute of Technology Officer Sean Collier on campus in Cambridge, Mass., Friday, April 18, 2014. Authorities say Collier was slain by the suspects in the 2013 Boston Marathon bombing. (AP Photo/Elise Amendola)
Flowers lay at a memorial stone after a one-year remembrance ceremony for Massachusetts Institute of Technology Officer Sean Collier on campus in Cambridge, Mass., Friday, April 18, 2014. Authorities say Collier was slain by the suspects of the 2013 Boston Marathon bombing. (AP Photo/Elise Amendola)
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Family and friends reminisced about Collier and remembered him as someone who touched people's lives and made a difference.

Collier's brother, Andy, says he's looking forward to the day he brings his kids to the playground. He tells The Sun of Lowell that though they'll never meet their uncle, they'll know everything about him.

The playground was built by Where Angels Play, a New Jersey-based nonprofit that also built a playground to honor victims of the Sandy Hook shooting.

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Boston Marathon bombing
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Playground honors MIT officer slain by marathon bombers
BOSTON - APRIL 15: Police officers with their guns drawn hear the second explosion down the street. The first explosion knocked down 78-year-old US marathon runner Bill Iffrig at the finish line of the 117th Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)
BOSTON - APRIL 15: Two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by David L. Ryan/The Boston Globe via Getty Images)
BOSTON - APRIL 15: (EDITOR'S NOTE: THIS IMAGE CONTAINS GRAPHIC CONTENT) Destruction and injured people at the site of the one of the explosions that went off near the finish line of the 117th Boston Marathon. Barricades hindered the EMS from getting to the injured. (Photo by John Tlumacki/The Boston Globe via Getty Images)
FILE - This Monday, April 15, 2013 photo provided by Bob Leonard shows Tamerlan Tsarnaev, third from left, who was dubbed Suspect No. 1 and second from left, Dzhokhar A. Tsarnaev, who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement. This image was taken approximately 10-20 minutes before the blast. (AP Photo/Bob Leonard)
BOSTON - APRIL 15: A second explosion goes off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by David L. Ryan/The Boston Globe via Getty Images)
FILE - In this April 15, 2013, file photo, Emergency Medical Services EMT Paul Mitchell, left, Carlos Arredondo, center, and Devin Wang, rear, push Jeff Bauman in a wheelchair after he was injured in one of two explosions near the finish line of the Boston Marathon in Boston. Opening statements are scheduled Wednesday, March 4, 2015, in the federal death penalty trial of Dzhokhar Tsarnaev for allegedly conspiring with his brother to place twin bombs near the finish line of the race, killing three and injuring 260 people. (AP Photo/Charles Krupa, File)
BOSTON, MA - APRIL 15: A man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Jim Rogash/Getty Images)
Runner John Ounao crying when he finds friends after several explosions rocked the finish of the Boston Marathon in Boston, Massachusetts, on April 15, 2013. At least two people were killed and 22 wounded when two explosions struck near the finish line of the Boston Marathon, sparking scenes of panic, police said. The streets were littered with debris and blood and paramedics raced off with stretchers as police locked down the area, witness said. TV footage showed an explosion sending up a white plume of smoke along the sidelines of the race. AFP PHOTO/John MOTTERN (Photo credit should read JOHN MOTTERN/AFP/Getty Images)
BOSTON - APRIL 15: Two officials run away from the first explosion, right, on Boylston Street at the 177th Boston Marathon, April 15, 2013. (Photo by John Tlumacki/The Boston Globe via Getty Images)
First responders load injured people into an ambulance where two explosions occurred along the final stretch of the Boston Marathon on Boylston Street in Boston, Massachusetts, U.S., on Monday, April 15, 2013. Two powerful explosions rocked the finish line area of the Boston Marathon near Copley Square and police said many people were injured. Photographer: Kelvin Ma/Bloomberg via Getty Images
Runners and spectators flee from the scene where two explosions occurred along the final stretch of the Boston Marathon on Boylston Street in Boston, Massachusetts, U.S., on Monday, April 15, 2013. Two powerful explosions rocked the finish line area of the Boston Marathon near Copley Square and police said many people were injured. Photographer: Kelvin Ma/Bloomberg via Getty Images
BOSTON, MA - APRIL 15: A runner reacts near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Alex Trautwig/Getty Images)
BOSTON - APRIL 15: Boston Police struggle to remove barricades to reach victims of the first explosion that went off near the finish line of the 117th Boston Marathon,. (Photo by John Tlumacki/The Boston Globe via Getty Images)
BOSTON - APRIL 15: A person who was injured in the first explosion is wheeled across the finish line of the Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)
BOSTON - APRIL 15: (EDITOR'S NOTE: THIS IMAGE CONTAINS GRAPHIC CONTENT) A person who was injured in an explosion near the finish line of the 117th Boston Marathon is taken away from the scene on a stretcher. (Photo by David L. Ryan/The Boston Globe via Getty Images)
BOSTON, MA - APRIL 15: A runner sits near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Alex Trautwig/Getty Images)
FILE - In this Monday, April 15, 2013 file, an unidentified Boston Marathon runner cries as she leaves the course near Copley Square in Boston after two explosions at the finish line. The Boston Marathon bombing has been selected the sports story of the year in an annual vote conducted by The Associated Press. (AP Photo/Winslow Townson, File)
FILE - In this image from video provided by WBZ TV, a bomb explodes near the finish line of the Boston Marathon in Boston on Monday, April 15, 2013. (AP Photo/WBZTV) MANDATORY CREDIT
FILE - This photo provided by Bruce Mendelsohn shows one of the sites of two bombs detonated during the 2013 Boston Marathon in Boston on Monday, April 15, 2013. (AP Photo/Bruce Mendelsohn) MANDATORY CREDIT: BRUCE MENDELSOHN
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion Monday, April 15, 2013 in Boston. Two bombs exploded near the finish line of the marathon on Monday, killing at least two people, injuring at least 22 others and sending authorities rushing to aid wounded spectators. (AP Photo/Charles Krupa)
Trash is strewn on the street near the finish line of the Boston Marathon where several explosions rocked the event April 15, 2013 in Boston, Massachusetts. At least two people were killed and 22 wounded when two explosions struck near the finish line of the Boston Marathon, sparking scenes of panic, police said. The streets were littered with debris and blood and paramedics raced off with stretchers as police locked down the area, witness said. TV footage showed an explosion sending up a white plume of smoke along the sidelines of the race. AFP PHOTO/John MOTTERN (Photo credit should read JOHN MOTTERN/AFP/Getty Images)
BOSTON, MA - APRIL 15: A swat team arrives at the corner of Stuart Street and Dartmouth Street after two explosive devices detonated at the finish line of the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Darren McCollester/Getty Images)
BOSTON - APRIL 16: Newspapers are on sale at a stand on Newbury Street on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images)
A mourner places a note with flowers at a police barricade near the finish line of the Boston Marathon in Boston Tuesday, April 16, 2013. The bombs that ripped through the crowd at the Boston Marathon, killing three people and wounding more than 170, were fashioned out of pressure cookers and packed with metal shards, nails and ball bearings to inflict maximum carnage, a person briefed on the investigation said Tuesday. (AP Photo/Winslow Townson)
This Friday, April 19, 2013 image made available by the Massachusetts State Police shows a police vehicle probing the boat where 19-year-old Boston Marathon bombing suspect, Dzhokhar Tsarnaev, was hiding in Watertown, Mass. He was pulled, wounded and bloody, from the boat parked in the backyard of a home in the Greater Boston area. (AP Photo/Massachusetts State Police)
(AP Photo/Massachusetts State Police)
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)
This Friday, April 19, 2013 image made available by the Massachusetts State Police shows 19-year-old Boston Marathon bombing suspect, Dzhokhar Tsarnaev, hiding inside a boat during a search for him in Watertown, Mass. He was pulled, wounded and bloody, from the boat parked in the backyard of a home in the Greater Boston area. Two U.S. officials say the surviving suspect in the Boston bombings was unarmed when police captured him hiding inside a boat in a neighborhood back yard. Authorities originally said they had exchanged gunfire with Dzhokhar Tsarnaev for more than one hour Friday evening before they were able to subdue him. (AP Photo/Massachusetts State Police)
This April 19, 2013, Massachusetts State Police photo, shows the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev hides in Watertown, Mass. Tsarnaev, 19, was captured later that night. Sean Murphy, photographer of this image, said it was made from the point-of-view where a law enforcement sniper took a position before the capture of Tsarnaev at the boat (AP Photo/Massachusetts State Police, Sean Murphy)
In this Friday, April 19, 2013 Massachusetts State Police photo, tactical emergency medical technicians tend to Boston Marathon bombing suspect Dzhokhar Tsarnaev, partially obscured center, at the time of his capture by law enforcement authorities in Watertown, Mass. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, Aug. 27, 2013 were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy)
This still frame from video shows Boston Marathon bombing suspect Dzhokhar Tsarnaev visible through an ambulance after he was captured in Watertown, Mass., Friday, April 19, 2013. A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Robert Ray)
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Race fans with a "Boston Strong" flag cheer for competitors near the finish line of the 118th Boston Marathon, Monday, April 21, 2014, in Boston. (AP Photo/Robert F. Bukaty)
A fan wears a Boston Bruins jersey bearing the Boston area code and "Boston Strong," remembering the city's solidarity after the Boston Marathon bombing in April, before Game 4 of the NHL hockey Stanley Cup Finals between the Bruins and the Chicago Blackhawks, Wednesday, June 19, 2013, in Boston. (AP Photo/Charles Krupa)
BOSTON, MA - NOVEMBER 02: Jonny Gomes #5 of the Boston Red Sox lays the World Series trophy and the 'Boston Strong 617' jersey onto the finish line of the Boston Marathon on Boylston Street during the World Series victory parade on November 2, 2013 in Boston, Massachusetts. (Photo by Jared Wickerham/Getty Images)
A "B Strong" logo adorns the grass in centerfield at Fenway Park while the Boston Red Sox work out on Wednesday, Oct., 2, 2013, in Boston. The Red Sox will pay tribute to victims of the Boston Marathon bombings when the AL division series opens Friday. The logo matches the patch the team has worn since the April 15 explosions. (AP Photo/Jimmy Golen)
BOSTON - MARCH 15: A bagpiper wears a Boston Strong jersey during the St. Patrick's Day Parade in the South Boston neighborhood on March 15, 2015. (Photo by Jessica Rinaldi/The Boston Globe via Getty Images)
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