Gendron, appears in court accused of killing 10 people in a live-streamed supermarket shooting in a Black neighborhood of Buffalo, N.Y., May 19, 2022. Brendan. 17 mai 2022 ยท Payton Gendron, the 18-year-old accused of killing 10 people at a supermarket in Buffalo on Saturday, wrote in increasing detail of his plans to murder dozens of Black people in statements posted.