By Michael Ausiello
June 10, 2010 at 07:20 PM EDT

Image Credit: Jason LaVeris/FilmMagic.comShawn Hatosy is making a pit stop in Miami before returning to Southland: Sources confirm to me exclusively that Hatosy has booked a multi-episode arc on Dexter.

A Showtime rep declined to divulge details on his character, but a recent Dexter casting call may offer a clue: The drama was seeking a thirtysomething actor to play the recurring role of a no-nonsense FBI agent. UPDATE: So much for my FBI theory. A source close to the show tells me that Hatosy is playing “a bad guy.”

After completing his Dexter arc later this summer, Hatosy will head immediately into production on Southland‘s 10-episode third season.

This marks the second major piece of casting for Dexter‘s upcoming fifth season. As I reported last month, Julia Stiles is also joining the cast as a mysterious young woman who forms a unique relationship with Dexter.