(Happy Valley, OR) -- Authorities say they've arrested a man who's accused of walking into a Happy Valley Denny's and setting a customer on fire. Clackamas County sheriff's deputies say 24-year-old DeShaun James Swanger was arrested last night without incident at a home on Southeast 80th. Investigators say Swanger sat next to the 69-year-old victim Wednesday night, poured liquid on him, and set him on fire. The man is listed in critical condition.