Who was Thomas Matthew Crooks?
So far, a confusing - and at times conflicting - picture has emerged of who Crooks was as a person.
Speaking to local news outlet KDKA, some young locals who went to school with him described him as a loner, who was frequently bullied and sometimes wore "hunting outfits to school".
Another former classmate of his, Summer Barkley, cast him differently, telling the BBC that he was "always getting good grades on tests" and was "very passionate about history".
"Anything on government and history he seemed to know about," he said. "But it was nothing out of the ordinary....he was always nice."
Others simply remembered him as quiet.
"He was there but I can't think of anyone who knew him well," one former classmate, who asked to remain nameless, told the BBC. "He's just not a guy I really think about. But he seemed fine.
Jameson Myers, a former member of the Bethel Park High School varsity rifle team who graduated alongside Crooks in 2022, told CBS that he did not make the team.
"He did not even make the junior varsity team after trying out," Mr Myers added. "He never returned to try-outs for the remainder of high school."
Mr Myers remembers Crooks as seemingly a "normal boy" who was "not particularly popular but never got picked on or anything."
“He was a nice kid who never talked poorly of anyone and I never have thought him capable of anything I’ve seen him do in the last few days.”
Other community members said simply that they were shocked that the alleged perpetrator of the shooting could have come from the quiet, green streets of Bethel Park.
Among them was Jason Mackey, a 27-year-old local man who lives near the Crooks residence and worked at his school while he was a student.
While Mr Mackey said that he did not know Crooks personally, he is still reeling from a sense of disbelief.
"It's just shocking. You wouldn't think an event of this magnitude would come right out of your backyard," he said. "It's just a crazy situation."
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