'Dexter': Julia Stiles joins the cast for Season 5

julia-stiles3-getty.jpg Julia Stiles is about to get cozy with a serial killer.

Stiles ("Save the Last Dance," "The Bourne Identity") has joined the cast of Showtime's "Dexter" for 10 episodes in the show's fifth season. She'll play a "mysterious young woman who forms a unique relationship with Dexter ( Michael C. Hall)" as he deals with the recent death of his wife ( Julie Benz).

Although don't count Dexter's wife out just yet -- Showtime says Benz will return to guest star in the show's season premiere.

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