(Gresham, OR) -- A suspect in a Gresham assault has been arrested. Police were trying to find the person who used a skateboard to hit a man on the head. The victim was hospitalized. Tuesday night, the 15-year-old suspect came with his parents to the Gresham Police Department and turned himself in. He was lodged at the Donald E. Long Juvenile Detention Facility and will be charged with assault.