Gregory Clark Hinz was 22 when he disappeared from Altadena, California, in November 1976. He is 6 feet tall, about 165 pounds, with blond hair, blue eyes, and at the time had a mustache and a short beard.

On March 1, 1977, Los Angeles Police located Hinz’s vehicle abandoned; it was later released to his family. No other developments were publicly reported and he has not been heard from since. His mother’s obituary later noted he predeceased her, but the circumstances of his disappearance remain unresolved. Dental records and DNA are available to assist identification.

Does anyone who knew Gregory or was in Altadena that November have information that could help investigators?