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.

The “No Kings” protest in Salt Lake City was struck by violence when a man allegedly brandished a rifle near the crowd, prompting someone nearby to fire three shots, hitting that man and a protester who later died.

The 39-year-old man shot and killed at a weekend “No Kings” protest in Salt Lake City was a successful fashion designer and former “Project Runway” contestant who devoted his life to celebrating arti...

Arturo Gamboa, 24, was also arrested and booked into the Salt Lake County Metro Jail on a murder charge.