Mark Thomas Schley was 29 when he was last seen in Jacksonville Beach, Florida, on December 17, 1984. He left town that day with a friend and never returned. The friend, who later died, became the primary suspect in Schley’s disappearance but investigators never developed conclusive evidence tying anyone to what happened.

Schley is described as 5 feet 10 inches tall, about 140 pounds, with brown hair, blue eyes and a scar on his groin. He may also have used the last name Welby. Law enforcement continues to treat this as a missing person case and has not ruled out foul play, but no significant leads have emerged.

Anyone who knew Mark, his movements in December 1984, or who can clarify the possible Welby surname is asked to contact the Jacksonville Beach Police Department with information.