DENVER — A private security guard working for a local TV station was jailed for investigation of first-degree murder in the deadly shooting of another man during dueling right- and left-wing protests in downtown Denver, police said Sunday.

Matthew Dolloff, 30, was taken into custody in connection with a clash that took place Saturday afternoon in Civic Center Park.

A man participating in what was billed a “Patriot Rally” slapped and sprayed Mace at a man who appeared to be Dolloff, the Denver Post reported, based on its photographs from the scene. The man identified by the newspaper as Dolloff drew a gun from his waistband and shot the other person, according to the Denver Post journalist who witnessed the episode.

The shooting victim, whose name was not released, died at a hospital.

A decision on any charges will be up to the Denver District Attorney’s Office, police said. A spokesperson for District Attorney Beth McCann said Sunday that the arrest affidavit in the case remained sealed and referred further questions to the police.

It was not immediately clear if Dolloff had an attorney.

Police Division Chief Joe Montoya said two guns were found at the scene, as well as a Mace can.

The shooting occurred beneath a city surveillance camera, and police said they have footage of the incident, KUSA-TV reported.

KUSA said it had hired the guard through the Pinkerton security firm. “It has been the practice of 9NEWS for a number of months to hire private security to accompany staff at protests,” the station said.

The right-wing Patriot Rally was one of two demonstrations happening at about the same time that drew hundreds of people to the park. Protesters at a left-wing “BLM-Antifa Soup Drive” nearby held up flags and signs railing against Nazis and white supremacists.

Representatives of Pinkerton did not immediately return email and telephone messages for comment.