The three people killed when a gunman opened fire at an In-N-Out Burger in Idaho included a worker at the…The three people killed when a gunman opened fire at an In-N-Out Burger in Idaho included a worker at the restaurant chain and a man from the area known for helping others get sober. Authorities released the names Tuesday of the people who died when the 24-year-old gunman opened fire at the Twin Falls restaurant. The In-N-Out location opened in late July as part of the California chain’s Idaho expansion. Chaos at In-N-Out BurgerThe attack Saturday at the In-N-Out Burger ended when the gunman, identified by police as Chad Williams, shot and killed himself. Witnesses described a chaotic scene in and around the Idaho restaurant as shots were fired.