Julia Stiles Julia Stiles

Julia Stiles will join the cast of Dexter for the series' upcoming fifth season, Showtime announced Monday.

The 29-year-old actress will guest-star in 10 episodes, playing a mysterious woman who forms a special relationship with Dexter Morgan (Michael C. Hall) in the wake of his wife's death.

Julie Benz returning to Dexter

Best known for her roles in 10 Things I Hate About You and Save the Last Dance, Stiles most recently appeared on Broadway in a 2009 production of David Mamet's Oleanna.

The new season of Dexter begins shooting this month and will premiere in the fall on Showtime.