Moonlight

Any private eye knows a lot about other people's secrets. L.A. private investigator Mick St. John (played by Alex O'Loughlin) has a secret of his own. He's an immortal vampire, bitten 60 years ago by his vampire bride, Coraline, on their wedding night.

Though popular with viewers, Moonlight aired just one season of 16 episodes on CBS from September 2007 through May 2008.