(Tillamook, OR) -- Police say they're looking for a missing Sheridan man who has a history of mental illness. Authorities say an abandoned vehicle belonging to 49-year-old James Shook was found on May 19th at Cape Lookout State Park. Shook hasn't been seen since May 13th in Lincoln City. Anyone knowing his location is asked to call the Oregon State Police Northern Command Center at 503-375-3555.