David Leo Graham, 25, was last seen December 25, 1972, in Los Angeles, where he had moved to attend Los Angeles Valley College. His disappearance led investigators to a key lead the following month: a vehicle tied to him was recovered at a used car lot in Tijuana, Mexico, in January 1973.

The Tijuana lot owner told investigators the person who sold the car was not Graham, which prompted suspicion that Graham did not voluntarily go to Mexico. Authorities suspect the person who sold the vehicle may have been involved in foul play. A circulated sketch depicts a Caucasian male with brown hair and brown eyes, about 180 pounds, but that person has not been identified.

Graham was declared legally deceased in 1980, yet the case remains unsolved and his family and law enforcement continue to seek answers. If anyone has information about David Graham, his car being sold in early 1973, or the man in the sketch, please come forward.