A man who was believed to be part of a peacekeeping team for the “No Kings” protest in Salt Lake City shot at a person who was brandishing a rifle at demonstrators, striking both the rifleman and a bystander who later died at the hospital, authorities said Sunday.

Out at Centennial Park, the home of the annual WestFest celebration, there were no remnants Monday of the tragedy that unfolded on the festival's final night.

Utah resident Arthur Folasa Ah Loo, 39, was shot and critically wounded during the protest in Salt Lake City on Saturday, June 14. He later died in the hospital from his injuries, the Salt Lake City Police Department confirmed in a news release.

Three people were taken into custody Saturday night in connection with a shooting during a "No Kings" protest in Salt Lake City, Utah, according to police.

The alleged rifleman, Arturo Gamboa, 24, was also shot and was taken into custody on a murder charge, Salt Lake City Police Chief Brian Redd said at a Sunday news conference. The bystander who was killed was identified as Arthur Folasa Ah Loo, 39, a fashion designer from Samoa.

I am so deeply saddened by the loss of life, especially that of an innocent bystander and an infant," Salt Lake County Mayor Jenny Wilson said in a statement.

A crazed gunman was taken into custody Saturday night after allegedly opening fire on thousands of protesters during a "No Kings" march, which left one person critically injured, Utah police said.

After a targeted shooting killed a former house speaker and her husband in Minnesota on Saturday, Utah leaders are speaking out.