Authorities are examining witness accounts and recordings after three victims were killed and seven others were wounded in Twin Falls.
TWIN FALLS, Idaho — Investigators worked Monday to determine why a 24-year-old man opened fire at a recently opened In-N-Out Burger, killing three people and injuring seven before dying from a self-inflicted gunshot wound, authorities said.
Twin Falls Police Chief Matthew Hicks identified the suspected shooter as Chad Williams and said investigators were confident he acted alone. Police had not announced a motive or released the names of the victims as detectives continued interviewing witnesses, reviewing recordings and notifying relatives.
The shooting was reported at about 2:29 p.m. Saturday at the restaurant on Blue Lakes Boulevard, in a busy commercial district where authorities said hundreds of people may have been nearby. Emergency dispatchers heard screams and gunfire as reports began coming in, and officers from several agencies responded.
Witnesses described customers and workers running from the restaurant and across nearby roads. Some people initially did not understand what was happening. Others took shelter, helped wounded people or gave strangers rides away from the area as police moved into the shopping plaza.
An off-duty Idaho state trooper and an armed civilian fired at Williams during the attack, according to police. Hicks said their actions diverted the shooter and helped drive him from the restaurant, likely preventing more people from being hurt. Williams’ body was found in an area near the business.
Police said three victims died and seven were injured. Two of the wounded had been treated and released by Sunday, three were in stable condition and two remained in critical condition. Authorities said those figures were preliminary.
One of the people killed was a female In-N-Out employee, company President Lynsi Snyder said. Her name had not been released. Snyder said the employee had been serving customers when she was killed and that the company was grieving with the victims’ families.
The Twin Falls location had opened July 24, about a week before the shooting, as the California-based restaurant chain continued expanding into Idaho. The attack turned the busy new location and the surrounding shopping area into a large crime scene that remained closed while investigators collected evidence.
Hicks said Williams’ family was cooperating with detectives and was also grieving. Authorities had not disclosed evidence indicating that any particular person or group was targeted. Police cautioned the public against repeating unsupported claims after another man was incorrectly identified online as the shooter.
The FBI joined the investigation and requested photographs, video and audio captured during the attack. Authorities said recordings from people in the area could help establish the shooter’s movements, clarify the sequence of events and document the responses of those who intervened.
Police continued asking witnesses and others with relevant information to come forward. The identities of additional victims, the findings of the evidence review and Williams’ possible motive had not been released as of Monday morning.
Author note: Last updated Aug. 3, 2026.