One of the three people killed when a gunman opened fire at an In-N-Out Burger had traveled to Idaho to help expand the restaurant chain. Police have not yet said what led the gunman, identified by police as 24-year-old Chad Williams, to open fire Saturday afternoon at the Twin Falls restaurant. The In-N-Out location opened in late July as part of the California chain’s Idaho expansion. Witnesses described a chaotic scene in and around the Idaho restaurant as shots were fired. During the attack, an off-duty state trooper and a civilian fired on Williams, diverting him from the restaurant, police have said.