Payton Gendron legally purchased the Bushmaster XM-15 E2S used in the attack on Tops Friendly Market from a federally licensed arms dealer near his home in Conklin, New York, about 200 miles southeast from Buffalo. In an online personal diary that surfaced after the attack, Gendron said he purchased the AR-15 type weapon in January, purchased a shotgun in December, and received a rifle as a Christmas present from his father when he was 16. Last year, Gendron was taken to the hospital for psychiatric evaluation under a state mental health law after writing “murder-suicide” in response to a teacher’s question. New York is one of 19 states with red flag laws that allow courts to take guns from people in immediate danger, but that didn’t happen with Gendron, who was 17 at the time. the time. State police described their threat as “general in nature” and said it “did not specifically mention shots or firearms.” After the shooting, Governor Kathy Hochul signed an executive order stressing the need for red flag interventions and said she would seek to ban those under 21 from purchasing semi-automatic weapons in the state. A similar law in California was ruled unconstitutional. Gendron is charged with murder.