Police identified the man accused of opening fire Saturday at a recently opened In-N-Out Burger location in Twin Falls, Idaho, as Chad Williams, 24, saying he died from a self-inflicted gunshot wound after fatally shooting an employee and a customer.Investigators believe Williams acted alone in the Saturday attack, Twin Falls Police Chief Matthew Hicks said during a news conference Sunday.Three people died, and seven others were wounded in the shootout, city spokesperson Josh Palmer previously said.Police reportedly found the suspected gunman dead near the restaurant.This is a developing story. Please check back for updates.The Associated Press contributed to this report.