You might know her as "Sarah Walker" on NBC's recently concluded series Chuck, but say "Goodbye" to one of the CIA's top agents and "Hello" to the newest killer-or-not to establish residence in Miami. Showtime announced today that Yvonne Strahovski will be joining the cast of Dexter for the hit serial killer drama's seventh season.

Strahovski's character will help Dexter (Michael C. Hall) unravel a case or two, but, unsurprisingly, Dexter will have his suspicions about her real motives.

We'll just have to wait until Dexter returns on September 30th, on Showtime, to see if Starhovski is a killer or not.

[via Vulture]