CIA Columbo: a metaphor for murder cover-ups.

Husband kills wife (Prescription Murder)
Wife kills husband. (Ransom for a dead man)
Fake author kills his writer partner (Mrs. Melville) (Murder by the Book)
World Champion chess players duel and die: (The Most Dangerous Match)
Surveillance spooks kills his client's younger wife: (Death lends a hand.)
Book agent kills his writer who is quitting: (Publish or Perish)
CIA kills CIA operatives: (Identity Crisis)
The Magic Castle and extortion: Now you see him. The Great Santini