• The shooter's former neighbor said Cruz pointed a BB gun at homes and did target practice in the neighborhood.
• Cruz had an Instagram account with posts that include photos of a rifle and a collection of firearms on a bed.
• The shooter legally purchased the firearm used in the shooting at a gun store in Coral Springs, Florida.
What we know about the shooter
The Sheriff's Office identified the 17 victims Thursday afternoon. As he read the names, the Sheriff Scott Israel acknowledged his "special friend," the school's assistant football coach Aaron Feis, who threw himself in front of students as bullets flew.
Cruz confessed to police to being the gunman, according to a probable cause affidavit. His public defender described him as a "deeply disturbed, emotionally broken" young man who is coming to grips with the pain he has caused.
"He's gone through a lot in a very short period of time and that does not minimize the loss of those families, but we have to put that into the proper light," Gordon Weekes said. "He is suffering from significant mental illness and significant trauma and he has some very difficult decisions to make shortly and we're going to assist him with those decisions."