The guard, Matthew Dolloff, had been hired as private security by a local news station that was covering dueling demonstrations on Saturday.
A private security guard hired by a Denver television news station was being held by the authorities in connection with a fatal shooting that happened on Saturday after opposing rallies between far-right and far-left activists. The guard, Matthew Dolloff,30, was being investigated for first-degree murder, the Denver Police Department said on Twitter on Sunday. He was being held in the Denver County Jail, according to court records. The shooting occurred at 3:37 p.m. local time, south of Civic Center Park, near the Denver Art Museum, as a protest by a right-wing group, Patriot Muster, and a counterprotest organized by a left-wing group, the Denver Communists, began winding down. The police kept the groups on separate sides of the park, which was divided by an amphitheater and temporary fencing. Some members of the right-wing group filmed and heckled the left-wing activists from across the fencing, though the groups did not engage in a large-scale verbal or physical confrontation, said Chelsea Jacobs, a member of the Denver Communists. It was unclear whether Mr. Dolloff, whose surname is spelled in jail records as Doloff, had been charged on Sunday. He had a court hearing on Sunday morning, records show, but an arrest affidavit was sealed. The district attorney did not respond to requests for comment and it was unclear if Mr.
