On June 14, 2025, during a "No Kings" march in downtown Salt Lake City, part of a nationwide wave of protests opposing the Trump presidency, a fatal shooting occurred that has sparked legal debate over self-defense and bystander liability. The march, which drew approximately 10,000 participants, was largely peaceful, but the event turned deadly when Afa Ah Loo, a 39-year-old protester and local fashion designer, was struck by a stray bullet.

According to reports, Matthew Alder, a 43-year-old Army veteran and volunteer on the protest’s self-appointed safety team, fired three shots at an armed man, Arturo Gamboa, who had been assembling a rifle during the demonstration. Mr. Alder stated he believed Mr. Gamboa was preparing to open fire on the crowd. Mr. Gamboa, a 24-year-old activist, contended that he was merely putting together his weapon to carry it openly, as permitted by Utah law, and was not threatening anyone.

The confrontation escalated as another volunteer observed Mr. Gamboa handling the firearm and alerted Mr. Alder. Mr. Alder discharged his weapon, hitting Mr. Gamboa and sending a third bullet down the street where it struck Mr. Ah Loo in the head, resulting in his death. Video evidence shows Mr. Gamboa moving away from the volunteers when the fatal third shot was fired, though Mr. Alder's defense maintains he did not shoot with others in his line of fire.

The shooting has led to a manslaughter charge against Mr. Alder, which is currently pending in Salt Lake County. The district attorney, Sim Gill, has argued that while the first two shots at Mr. Gamboa might be justified under Utah’s self-defense laws, the third bullet, fired when the threat appeared to have dissipated and aimed into a crowd, was reckless and unjustified. He highlighted that an innocent bystander should not bear the consequences of such actions. Mr. Alder’s lawyer contends his client was acting in fear for the crowd’s safety.

In addition to criminal charges, Mr. Ah Loo’s widow has filed a civil lawsuit against Mr. Alder and the event’s organizers, alleging inadequate oversight and the presence of armed volunteers among protesters contributed to the fatal incident. The local affiliate of the No Kings movement, which initially sanctioned safety volunteers carrying firearms, has since been disavowed by the national organization, which enforces a strict no-weapons policy at demonstrations.

Mr. Ah Loo was regarded as a respected figure in Salt Lake City’s Pacific Islander and transgender communities and had only recently become a U.S. citizen, after which he became increasingly engaged in political activism. Mr. Gamboa survived his injury but suffered lasting physical and financial impacts, including a significant medical bill and job loss.

The legal questions raised by this incident touch on complex intersections of self-defense law, Second Amendment rights, and public protest safety. Legal experts note that the case may influence future discussions about when the use of deadly force in a protest environment crosses into criminal behavior, especially when bystander fatalities occur.

As the legal proceedings continue, the Salt Lake City community and organizers of nationwide demonstrations are reconsidering security protocols, emphasizing non-violence and clear policies to prevent future tragedies. Meanwhile, Mrs. Ah Loo is relocating with her children, carrying forward the memory of her husband and the unresolved challenges posed by his death.