Glenn Barry Patterson was 30 when he was last seen at Schoodic Lake in Piscataquis County, Maine, on September 30, 1989. He was described as White, brown hair and eyes, about 5 feet 9 inches to 5 feet 10 inches tall, 155–165 pounds, with a small mole on the right side of his nose and a small scar at the outside corner of his right eye. At the time he disappeared he was reported to be wearing work boots, jeans, a shirt, and a red-and-black checkered jacket, and believed to have had a bone-handled jackknife in a holder and his wallet.

Glenn went out on the lake that day with his friend Jeffrey Hall. Their outing was on the final day of fishing season. The men did not return; the next day their boat was found partially submerged on Schoodic Lake with various items aboard, but neither man was located. The Maine Warden Service is listed as the investigating agency and NamUs maintains the case as MP54341, with DNA reference information noted.

If anyone was on or near Schoodic Lake around September 30, 1989, or has information about that fishing trip, please share what you know.