The student who killed one and injured three in a mass school shooting was obsessed with guns and violent TV shows such as ‘Breaking Bad’.
Caleb Sharpe brought a rifle and a handgun in a duffel bag into his high school in Spokane, Washington, before opening fire outside a classroom.
Police said the first weapon jammed, prompting a fellow student to bravely intervene.
But the heroic boy, named locally as Sam Strahan, was shot in the head and died.
Sharpe then turned and fired into the hallway, hitting three girls.
They are in hospital but are expected to survive.
A member of staff apprehended Sharpe at Freeman high school before he could do any more harm, and he is now in custody.
Sharpe’s social media channels paint a disturbing picture of a troubled teen.
The last upload on his YouTube channel showed Sharpe and a friend simulating their own shootout in June.
He is wielding a number of guns which look like air rifles, but realistic audio of gunshots has been added.
In what now appears eerily significant, the video opens with Sharpe’s friend lying on the ground playing dead from a gunshot wound.
On his Instagram account, Sharpe posted an image of him holding an enormous bullet last September.
And in another, he posted a selfie with two guns, which again look to be toys rather than real, in the background.
Michael Harper, 15, said he was a close friend of the shooter. More from Mirror