Julia Stiles (The Omen) will be joining the cast of Showtime’s “Dexter” in what is only being described as a “top-secret role.” The award-winning series begins its fifth season this fall.

Some entertainment websites are speculating that Stiles will either play a relative of Dexter’s late wife Rita or a new addition to the Miami Metro Police Department.

My guess? After watching her turn in a series of lifeless performances in films as varied as the Jason Bourne action series, Mona Lisa Smile, and Hamlet, I’m gonna say she’s been cast as a corpse.

In related “Dexter” news, producers have confirmed that Julie Benz will return as Rita in the first episode of season 5, but not as a ghost (like Dexter’s dad).

The show’s executive producers explain:

We’re not going to do some ghostly thing with her. We reserve those for Harry. If you have too many things like that it becomes gimmicky.

Up next for Benz is a role in ABC’s “No Ordinary Family,” in which she plays a superhero milf opposite “The Shield’s” Michael Chiklis.