LOS ANGELES — On Thursday, Feb. 22, around 7 p.m. local time, Harley Parker was thumbing through his phone, looking at friends’ Instagram stories, when he came across a photo from an old high school football teammate, Jonathan Martin. It was a picture of a slice of pizza from a shop in Westwood, Parker recalls. He sent Martin a direct message—“its so good”—and then kept scrolling through his account.
“Then it just got really intense, really fast,” Parker says.
A tap or two later, he came across a picture of a shotgun, surrounded by 18 rounds of ammo.