Nearly a week after 19-year-old Nikolas Cruz walked into Marjory Stoneman Douglas High School in Parkland, Fla. and gunned down 17 people, federal and state authorities are putting together a picture of Cruz's thought and behavior leading up to the shooting.
Over the years Cruz displayed signs of aggressive behavior and a troubled mind, according to documents from the school board, social services and federal authorities as well as interviews with neighbors and classmates. Here's a timeline of events leading up to the shooting.
January 13, 2016
Cruz began attending classes at Stoneman Douglas High school after transferring from Cross Creek School in Pompano Beach, a school for emotionally and behaviorally troubled students, according to school records obtained by WPLG Local 10 News, an ABC News affiliate.
Cruz reportedly displayed aggressive behavior frequently in middle school and the behavior continued into high school. He reportedly received dozens of disciplinary actions, including suspensions.
September 20, 2016
Cruz is suspended from school after a fight, according to multiple news reports citing school records.
Cruz reportedly got into a fight with Enea Sabadini, a classmate who was dating Cruz's ex-girlfriend, according to Buzzfeed.
September 28, 2016
The Florida Department of Children and Families (DCF) responded to a report of allegations of inadequate attention and medical neglect at Cruz's home. Cruz was taking medication for ADHD at the time.
According to public records from DCF, an Adult Protective Investigator interviewed Cruz and the school guidance counselor and found no evidence of abuse from Cruz's mother, Lynda.
However, according to the report, Cruz had been cutting his arms and recording it on Snapchat.
Although DCF reported Cruz did not own any weapons at the time, Cruz said he wanted to buy a gun.
The documents from DCF reveal Cruz was receiving mental health treatment at the Henderson Behavioral Health clinic, however, clinicians determined Cruz was not a risk to himself or others.
Cruz reportedly stopped getting mental health treatment around December, Broward Mayor Beam Furr told the Sun Sentinel.
January 19, 2017
Cruz was suspended from school for an assault, according to WPLG. School officials requested a "threat assessment" after the incident, but it's unclear whether or not that assessment was carried out.
February 8, 2017
Cruz withdrew from of Stoneman Douglas High School and then bounced between three different schools, according to the Sun Sentinel. It's been reported that Cruz was expelled for disciplinary reasons, but school records indicate that he was transferred. Students told WPLG that ammunition had been found in his backpack.
February 11, 2017
Cruz purchased the AR-15 rifle used in the shooting at Sunrise Tactical Supply in Coral Springs. Cruz passed a background check, which included a mental health question and obtained the gun legally.
September 24, 2017
The FBI received a tip from Ben Bennight, a bail bondsman at AFAB Bail Bonds in D'Iberville, Miss. about a disturbing comment made by a person using the name Nikolas Cruz on a YouTube video on his channel. The comment read "I'm going to be a professional school shooter."
The FBI said it was unable to verify the location of the commentator or confirm the true identity of the person who made the account.
Reports say classmates said Cruz had often sent threatening messages on social media posted photos of his guns on Instagram.
November 1 2017
Cruz's mother, 68 died November 1 of pneumonia brought on by the flu. Shortly after, Cruz and his younger brother, Zahchary, went to live with friends.
January 5, 2018
The FBI received another tip about Cruz. This time from an anonymous caller who phoned into the FBI’s Public Access Line, located in Clarksburg, W.Va.
The caller reportedly warned about "Cruz’s gun ownership, desire to kill people, erratic behavior, and disturbing social media posts, as well as the potential of him conducting a school shooting," according to USA Today.
The FBI said it did not follow up on the tip.
"Under established protocols, the information provided by the caller should have been assessed as a potential threat to life," the FBI said, according to USA Today.
February 14, 2018
Cruz entered his former high school with an AR-15 and opened fire. He killed 17 people and injured another 15. Cruz has been charged with 17 counts of premeditated murder.