Rudolph David Rangel, 27, was last seen in San Francisco on March 13, 1982. Known as Rudy, he was wearing a black suit when he vanished. He had several distinguishing features: an inverted U-shaped scar above his left ear, a scar near his sideburn, and a quarter-size piece of skull missing.

Rangel was mentally disabled and had epilepsy, factors that led authorities to classify him as an endangered missing person. Few details about his movements the day he disappeared have been made public, and investigators report no significant leads. The San Francisco Police Department continues to investigate and his case appears in multiple missing persons databases.

Did anyone in San Francisco in March 1982 know Rudy or see him that day?