Peter and his wife, Joan Davis, were last seen in Los Angeles, California on March 17, 1982. They have never been heard from again. Harvey Rader was named as a possible suspect in their cases. Rader was tried several times on counts related to the 1982 California disappearances of Michalle Houchman and her family members. He was acquitted at the conclusion of his most recent trial in 1992. Authorities believe that Rader may have murdered Peter and Joan as the result of a business-related dispute. He was never charged in connection with their cases, which remain unsolved.

Peter and Joan resided in Granada Hills, California in 1982.