Issam Ibrahim Atieh, 22, was last seen on December 9, 1984, at a beach in San Francisco. Of Saudi Arabian descent and known by the nickname Sam, he was wearing a light gray jacket, matching dress pants, a white dress shirt and black shoes, and had a mustache when he disappeared.

Investigators have suspected he may have drowned, but his body has never been recovered and the exact circumstances remain unclear. Authorities have not ruled out foul play, and the San Francisco Police Department keeps the case open; Issam remains listed as an endangered missing person in databases. The long passage of time and lack of physical evidence have complicated efforts to determine what happened after he was last seen.

If anyone remembers Issam, saw him at the beach that day, or has information about his whereabouts, please come forward.