Some details are emerging about the man suspected of opening fire outside an In-N-Out Burger location in Idaho over the weekend, killing three people, as a motive in the mass shooting remains under investigation. The suspect in Saturday's shooting -- 24-year-old Chad Williams -- died from an apparent self-inflicted gunshot wound after police say he opened fire near a busy shopping area in Twin Falls. Obtained by ABC News - PHOTO: A bystander video verified by ABC News shows an alleged gunman preparing to open fire on a vehicle, Aug. 1, 2026, near an In-N-Out Burger restaurant in Twin Falls, Idaho. College of Southern Idaho - PHOTO: A law enforcement source confirmed that the shooting suspect, Chad Williams, is seen in this photo. The Twin Falls Police Department said investigators are "confident" the suspect acted alone.