Innocent Bystander Killed: Peacekeeper’s Fatal Error

A safety volunteer’s split-second decision to fire at an armed protester has exposed a dangerous contradiction between what police said happened and what bystander video actually captured.

Quick Take

Matthew Alder, a peacekeeper at a June 2025 Salt Lake City “No Kings” protest, has been charged with manslaughter for fatally shooting innocent bystander Arthur Folasa Ah Loo while attempting to stop an armed man
Bystander video contradicted police accounts, showing the armed man walking with his rifle barrel pointed downward before running only after shots were fired
The protest organizers had explicitly prohibited weapons, yet armed peacekeepers were present without authorization in the event permit
Prosecutors declined to charge the man who brought the rifle to the demonstration despite his initial arrest on suspicion of murder

When Armed Security Goes Wrong at a Political Gathering

On June 14, 2025, approximately 10,000 people gathered near State Street in downtown Salt Lake City for a permitted “No Kings” protest organized by a local chapter of the 50501 Movement. The event drew anti-government activists exercising their constitutional right to assemble. What should have been a routine demonstration became a tragedy when Matthew Alder, working as a safety volunteer on a peacekeeping team, fired three shots at a man carrying an AR-15-style rifle. One of those bullets struck Arthur Folasa Ah Loo, a beloved local fashion designer and father, killing him instantly.

The Official Story Crumbles Under Video Evidence

Salt Lake City police initially reported that eyewitnesses claimed the armed man, later identified as Arturo Roberto Gamboa, had pulled his rifle from a backpack and was running toward the crowd with the weapon raised when peacekeepers confronted him. This account justified the use of force and made the shooting appear reactive and necessary. On June 23, 2025, nine days after the incident, bystander footage emerged that told a completely different story. The video showed Gamboa walking with the rifle barrel pointed at the ground, only beginning to run after Alder fired the first shot.

Contradictions That Matter

This contradiction between official narrative and video evidence raises fundamental questions about police investigation accuracy and eyewitness reliability under stress. When law enforcement provides an account of events that video directly contradicts, public trust erodes. The video evidence suggests Gamboa was not the immediate threat police described, which fundamentally changes the justification for using lethal force. A man walking with a lowered rifle barrel presents a different tactical situation than one running with a raised weapon toward civilians.

The Salt Lake City Police Department’s initial characterization shaped the entire investigation trajectory. When bystander video emerged contradicting that account, it forced prosecutors to reassess culpability. On December 3, 2025, Salt Lake County District Attorney Sim Gill announced that Matthew Alder would be charged with manslaughter. Notably, prosecutors decided not to charge Arturo Gamboa, the man who brought the rifle to a protest where organizers had explicitly instructed participants not to bring weapons.

The Organizational Response and Accountability

The 50501 Movement’s national organization responded decisively by severing ties with the local Salt Lake City chapter that organized the event. This action signals that national protest movements recognize their responsibility for security failures at local demonstrations. The decision to cut ties suggests the national organization viewed the local chapter’s handling of armed security as a serious breach of protocol and safety standards.

Unanswered Questions About Authorization

The event permit for the June 14 demonstration did not specify that armed security would be present. Protest organizers instructed both attendees and safety personnel not to bring weapons. Yet armed peacekeepers showed up anyway, creating a volatile situation where unofficial armed security confronted an armed protester. This gap between permit requirements and actual conditions reveals a systemic failure in event planning and coordination that preceded the shooting itself.

A safety volunteer accused of killing a man in a “No Kings” protest in Salt Lake City while firing at another man he believed to be a potential mass shooter has been charged with manslaughter, prosecutors announced Wednesday.https://t.co/Sd56caOtlX

— WDHN (@WDHN) December 4, 2025

Matthew Alder’s attorney, Phil Wormdahl, has not yet provided public comment on the manslaughter charges. District Attorney Sim Gill released a statement expressing grief: “We appreciate the patience of the family of Mr. Ah Loo and the community as our office went through the screening process. We grieve the loss of Mr. Ah Loo as a husband, father, and active member of our community.” The charging decision came after a thorough screening process by the District Attorney’s office, suggesting prosecutors examined evidence carefully before deciding Alder bore criminal responsibility.

The Broader Implications for Protest Security

This incident establishes important precedent about armed peacekeeping at political demonstrations. When individuals without law enforcement training carry firearms and make split-second decisions about using lethal force, innocent people die. The fact that Alder fired three shots, striking both his intended target and an innocent bystander, raises questions about accuracy, training, and proportionality in force decisions. Arthur Folasa Ah Loo paid the ultimate price for a security failure he had nothing to do with.