O'Leary was last seen at approximately 1:00 a. m. on February 14, 1988 in North Hollywood, California. His friend told authorities that he saw O'Leary outside of the Jobsite Bar on Vineland Avenue. O'Leary was sitting alone in the back of his Nissan pickup truck at the time. O'Leary's vehicle was discovered abandoned in the Angeles National Forest in California more than one week after he vanished. There was no sign of him at the scene. He was a resident of the Eagle Rock community area of Los Angeles, California in 1988.