Nikolas Cruz researched Columbine massacre before Parkland shooting

Nikolas Cruz studied the Columbine High School massacre ahead of his own deadly rampage in Parkland, Fla. earlier this year.

The revelation comes from a new commission set up to investigate the Feb. 14 mass shooting at Marjory Stoneman Douglas High School, where Cruz is charged with killing 17 people.

“He mapped it out, he had been planning this for a while,” Pinellas County Sheriff Bob Gualtieri, who chairs the state legislature-created commission, said Tuesday in comments carried by the Sun-Sentinel.

Thirteen people were killed during the April 1999 massacre at Columbine, where two students armed with a trove of guns carried out a planned attack before killing themselves.

It was one of the worst school shootings at the time, prompting a wave of new security standards in schools to deal with a potential gunman.

The new commission’s 20 members, who held their first meeting Tuesday, also watched a rough animation that illustrated how Cruz moved through the school’s freshman building with his legally bought AR-15-style rifle.

49 PHOTOS
Shooting at Marjory Stoneman Douglas High School in Florida
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Shooting at Marjory Stoneman Douglas High School in Florida
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
PARKLAND, FL - FEBRUARY 14: People wait for loved ones as they are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students leave Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Eva Claire HAMBACH (Photo credit should read EVA CLAIRE HAMBACH/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students are released from a lockdown outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Medical personnel tend to a victim outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Medical personnel tend to a victim outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Police and security vehicles are seen at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG / The erroneous mention[s] appearing in the metadata of this photo by Michele Eve SANDBERG has been modified in AFP systems in the following manner: [Byline: Michele Eve SANDBERG] instead of [Eva Hambach]. Please immediately remove the erroneous mention from all your online services and delete it from your servers. If you have been authorized by AFP to distribute it to third parties, please ensure that the same actions are carried out by them. Failure to promptly comply with these instructions will entail liability on your part for any continued or post notification usage. Therefore we thank you very much for all your attention and prompt action. We are sorry for the inconvenience this notification may cause and remain at your disposal for any further information you may require. (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: The Marjory Stoneman Douglas High School is seen after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Security speak with people near Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michelle Eve SANDBERG (Photo credit should read MICHELLE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students gather following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami, February 14, 2018 . A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
A student wears a Valentine's pin as she leaves Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: Fire Rescue personnel work the scene at the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Police and fire rescue vehicles converge on Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
MAJORY STONEMAN DOUGLAS HIGH SCHOOL, PARKLAND, FLORIDA - OCTOBER 31, 2017: Marjory Stoneman Douglas High School in Parkland, Broward County, Florida. (Photo DigitalGlobe via Getty Images)
Students leave Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Parents confer with security following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami, February 14, 2018 . A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Police officers ride in the back of a pick up truck with a victim outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
A law enforcement officer directs traffic outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
A young woman who just walked out from the direction of the high school, who refused to give her name, gets a hug as she reaches the overpass at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Marjorie Stonemason Douglas High School where a shooting occurred on Wednesday, Feb. 14, 2018 in Parkland, Fla. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
A student reacts as she talks to a television reporter at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
SWAT vehicles converge on Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Students react at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
People react at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students are released from a lockdown outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students are evacuated by police out of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Mike Stocker/Sun Sentinel/TNS via Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students are brought across Coral Springs Drive from the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
Waiting for word from students at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
SWAT vehicles converge on Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Waiting for word from students at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
Trauma surgeon Dr. Igor Nichiporenko (C) and director for emergency medicine Dr. Evan Boyar (R) address the media outside the Broward Health Emergency facility where victims were taken following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. Seventeen people were killed when a 19-year-old former student opened fire with a semi-automatic rifle at the Florida high school, the local sheriff said, calling the scene 'horrific.' Broward County Sheriff Steve Israel said the victims were a mix of students and adults, though he could not confirm if the adults were teachers. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Waiting for word from students at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
Florida Governor Rick Scott (4th-L) visits Marjory Stoneman Douglas High School following a shooting that killed 17 people on February 14, 2018 in Parkland, Florida. A former student armed with an AR-15 rifle opened fire at a Florida high school, killing at least 17 people, officials said, in a harrowing shooting spree that saw terrified students hiding in closets and under desks as they texted for help. Broward County Sheriff Scott Israel identified the gunman as Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland who had been expelled for 'disciplinary reasons.' / AFP PHOTO / Gaston De Cardenas (Photo credit should read GASTON DE CARDENAS/AFP/Getty Images)
BROWARD, UNITED STATES - FEBRUARY 14: Students meet their families following a school shooting at Marjory Stoneman Douglas High School in Broward, Florida on February 14, 2018. At least 17 people were killed Wednesday when a lone gunman opened fire on a Florida high school, according to police. The victims are a mix of students and adults, officials said. (Photo by Carlos Miller/Anadolu Agency/Getty Images)
Police vehicles block the road to Marjory Stoneman Douglas High School in Parkland, Florida, following a shooting that killed 17 people on February 14, 2018 in Parkland, Florida. A former student armed with an AR-15 rifle opened fire at a Florida high school, killing at least 17 people, officials said, in a harrowing shooting spree that saw terrified students hiding in closets and under desks as they texted for help. Broward County Sheriff Scott Israel identified the gunman as Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland who had been expelled for 'disciplinary reasons.' / AFP PHOTO / Gaston De Cardenas (Photo credit should read GASTON DE CARDENAS/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: Nathanael Clark (L) and his father, John Clark, speak to the media after Nathanael escaped the shooting at Marjory Stoneman Douglas High School that killed 17 people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
PARKLAND, FL - FEBRUARY 14: Sarah Crescitelli leans on her mother, Stacy Crescitelli (L) after she escaped the shooting at Marjory Stoneman Douglas High School that killed 17 people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
The location where suspect Nikolas Cruz was caught by police at a townhouse in Pelican Pointe at Wyndham Lakes in Coral Cables, Florida following the deadly shooting at Marjory Stoneman Douglas High School in Parkland, Florida on Febreuary 14, 2018. A former student armed with an AR-15 rifle opened fire at a Florida high school, killing at least 17 people, officials said, in a harrowing shooting spree that saw terrified students hiding in closets and under desks as they texted for help. Broward County Sheriff Scott Israel identified the gunman as Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland who had been expelled for 'disciplinary reasons.' / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Parents meet at the Fort Lauderdale Marriott Coral Springs Hotel to pick up their children following a mass shooting at nearby Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (Jim Rassol/Sun Sentinel/TNS via Getty Images)
Parents meet at the Fort Lauderdale Marriott Coral Springs Hotel to pick up their children following a mass shooting at nearby Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (Jim Rassol/Sun Sentinel/TNS via Getty Images)
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A black dot with a line jutting out was meant to denote Cruz, who made his way from the first to third floor in a matter of minutes.

Dots meant to represent his victims turn from green to purple for the people Cruz killed, and to yellow for those who were injured.

Parents of some students killed in the tragedy were rattled to see the crude re-enactment of the children’s last moments.

“I knew which dot was my daughter so it was pretty brutal for me,” Andrew Pollack, a commission member whose daughter Meadow was killed, said to the Sun-Sentinel.

At no point did Cruz make it into a class room, the recording shows, confirming survivor accounts that he shot through doors and windows.

Investigators who presented the video credited teachers’ on the second floor for going into a “Code Red” to lockdown their classrooms, and no one was shot.

Cruz was able to strike several people when he made it to the third floor, however, when the gunsmoke from his rifle set off fire alarms.

Pollack, who lost his daughter, refused to refer to Cruz by name during the hearing, instead using his prison number: 18-19-58.

He questioned why the Broward County Sheriff’s Office hadn’t compiled a full review of Cruz’s infractions leading up to the massacre, asking if it’s "normal, two months after an investigation [started], not to have all his disciplinary records," according to the Miami Herald.

13 PHOTOS
Parkland students return from spring break to clear backpacks
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Parkland students return from spring break to clear backpacks
Starting off the last quarter of senior year right, with a good ol’ violation of privacy! https://t.co/Glf9C14dsq
:) @marcorubio https://t.co/eBmB9Tz9uB
.@marcorubio https://t.co/yxuXCRGCiE
This backpack is probably worth more than my life #trends #NeverAgain https://t.co/sVAfRbt12R
MSD ➡️ TSA https://t.co/3k1xMq9UDk
My new backpack is almost as transparent as the NRA’s agenda. I feel sooo safe now. As much as I appreciate the… https://t.co/elIbobMVad
Nothing beats a morning walk through fenced lines with a bag check! Where am I, again? https://t.co/6gDPs8zZ3Q
You have to get pre-check next time https://t.co/YO5UWaDWUd
General consensus is frustration from students and teachers re: clear backpacks. Personally, though, I don’t mind t… https://t.co/mTLawgoDyI
This new “school security” policy is just a late April fools joke, right? Cause none of us are laughing and it’s pretty terrible.
This is literally so dumb. The clear backpacks and check points create this false sense of security. Anyone can eas… https://t.co/2RRhqPfx0T
Me and my man Thomas Jefferson feel safe now ! https://t.co/XNIkXjdguB
But how satisfying would it be to put glue all over this backpack and peel it off https://t.co/vfFwIKlaAL
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Gualtieri signaled some people weren’t working with the investigation, which will put out a report in January, but threatened to use its subpoena power if necessary.

“We’ve got some hard questions that need to be answered,” he said.

Cruz, who faces 17 murder counts, is due in court Friday for a hearing.

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