Richard Marion Rideout was 50 when he was last seen on August 25, 1984, in Long Beach, California. He is described as a Caucasian male, 5 feet 11 inches tall, about 150 pounds, with black hair.

The circumstances of his disappearance are unclear and no substantial leads have emerged. His case is registered with NamUs and remains unsolved despite searches and investigator interest.

Anyone who knew Richard, his routines, associates, or saw him in Long Beach around August 25, 1984, is asked to contact the authorities with any information, however small.