More details have emerged about what allegedly happened before an “innocent bystander” was gunned down while participating in a “No Kings” protest in Utah on Saturday, including how he was a beloved fashion designer who appeared on the reality television show “Project Runway” — and how the man accused of starting it all was allegedly confronted by a father of three as he hid among protesters after the gunfire.

Arthur Ah Loo, 39, was apparently hit by stray gunfire from a “peacekeeping” volunteer who was allegedly trying to stop another peacekeeper, Arturo Gamboa, from pulling an AR-15-style rifle out of a backpack while protesters were going by. Ah Loo’s death was the only fatality reported during the nationwide “No Kings” demonstrations on Saturday.

Protesters have described Gamboa as being dressed in black and acting calmly before he allegedly tried taking out the rifle, according to The Salt Lake Tribune.

One demonstrator, Sam Hernandez, told the local newspaper he and others spotted the stock of the rifle in Gamboa’s backpack after the shooting and confronted him about it while he tried hiding among protesters, the Tribune reports. Video captured by bystander Ben Behunin and obtained by the paper allegedly shows the confrontation, with Hernandez saying loudly, “This is a rifle right here,” moments after prying the gun out of his hands and yelling toward police.

“Hey! This guy, I just grabbed this from this guy. He’s right there!” Hernandez said, according to the Tribune.

“He tried to grab it a little bit,” the father of three later recounted. “But I grabbed it and I held it out for the police.”

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According to the Salt Lake City Police Department, about 10,000 people were downtown as part of a nationwide protest opposing President Donald Trump‘s military parade in Washington, D.C., and his immigration policies.

Shortly before 8 p.m. cops heard a volley of shots, the police department says, sending panicked demonstrators fleeing for safety in parking garages and local businesses. Officers found a man, later identified as 39-year-old Arthur Folasa Ah Loo, who had been shot. First responders tried saving Ah Loo, but those efforts were unsuccessful and he died.

“The preliminary investigation shows Ah Loo was participating in the demonstration and appears to have been an innocent bystander who was not the intended target of the gunfire,” the police statement said.

Behunin described Hernandez as “one of the heroes in the story,” with police also noting how “the crowd” pointed Gamboa out to law enforcement after he tried hiding among protesters, the Tribune reports. He allegedly had a gas mask inside his backpack, in addition to the gun.

“I wasn’t thinking of my life at all,” Hernandez recalled. “I said, ‘This guy’s got a gun.’ Someone’s got to take him down.”