I have found several real-life married couples that starred in Columbo: 1. Peter Falk (Columbo) & Shera Danise (many episodes) 2. John Cassavetes (Alex Benedict - "Etude in Black") & Gena Rowlands (Elizabeth Van Wick - "Playback") 3. Bettye Ackerman (Ms. Sherman - "Blueprint for Murder") & Sam Jaffe (Dr. Henry Willis - "Forgotten Lady") 4. Robert Culp (many episodes) & France Nuyen (Miss Choy - "Murder Under Glass") Any more?