The young man charged with killing 17 people at his former Florida high school worried some of his classmates, talking about his guns and sharing pictures of small animals he had shot.
He had a "very disturbing" social media presence and had been expelled from school, officials said, supplying new details on the life of accused shooter, Nikolas Cruz.
Cruz, 19, has been charged with 17 counts of premeditated murder in the attack Wednesday at Marjory Stoneman Douglas High School in Parkland, Florida, which he was expelled from last year for disciplinary reasons, officials said. The shooting unfolded around the time classes were dismissed for the day.
Cruz admitted to the attack, telling investigators he brought the AR-15 and several loaded magazines stuffed into a backpack and planned to leave them behind in order to blend in with fleeing students, according to a police affidavit.
A motive in the shooting remains unclear.