Salt Lake City police are investigating the roles of two self-described "peacekeepers" following a fatal shooting at Saturday's protest that left one person dead and another injured, raising questions about unauthorized security at public demonstrations.

A bystander was fatally shot after security members at the demonstration confronted a man who was running toward the crowd with an AR-15-style rifle, the police said.

SALT LAKE CITY (KUTV) — The man who was fatally shot during the Salt Lake City "No Kings" protest was a fashion designer with a local company and a former contestant on Bravo's "Project Runway." Police identified the victim of Saturday's shooting as Arthur Folasa "Afa" Ah Loo.