Southern California authorities investigating the death of a Jewish man following a fight with a pro-Palestinian demonstrator over the Israel-Hamas war haven’t determined whether a crime occurred and on Tuesday asked for the public’s help to unravel what happened.

Ventura County Sheriff Jim Fryhoff said deputies determined that Paul Kessler, 69, who died early Monday at a hospital, had fallen backward and struck his head on the ground at a pro-Palestinian demonstration Sunday afternoon in Thousands Oaks, a suburb northwest of Los Angeles.

The pro-Palestinian demonstrator stayed at the scene and told deputies he had called 911, Fryhoff said.