Ingrid Anderson, 27, disappeared from Richmond, California, on May 20, 1971. She was last seen at her home; her car remained parked outside while she was gone and her mother later reported her missing. At the time of her disappearance Ingrid and her husband, a Richmond police officer, were in the middle of a divorce. On the day she vanished he had taken their two sons to a barbershop and, after returning home, found Ingrid missing. Nine months later he remarried and moved out of state with the family.

Ingrid was 5 feet 2 inches tall, about 120 pounds, with brown hair and blue eyes. The circumstances of her disappearance are unclear, there are few details about what might have happened, and foul play is suspected. Does anyone who knew Ingrid or the family have information that could help explain what happened that day?