Wallace L. Vaughan was 27 and living on Canyon Highlands in Oroville, California, when he disappeared on January 1, 1990. His family did not report him missing until about a decade later after receiving threats, which delayed investigative efforts.

Authorities suspect Vaughan may have been involved in drug activity around the time he vanished, and foul play is strongly suspected. Investigators have treated the case as a possible homicide, but it remains unsolved and his whereabouts are unknown.

Anyone who knew Wallace, his associates, or who has information about unusual activity in Oroville around 1990 is asked to come forward with tips or leads.