Okay, so we still don’t know what role she’ll be playing exactly, but we have more clues now thanks to a press release from Showtime about Stiles joining the show. Stiles will appear in ten episodes of “Dexter’s” fifth season, and will play “a mysterious young woman who forms a unique relationship with Dexter in the wake of the death of his wife.”
That basically means she won’t be a cop chasing Dexter, which was the going rumor when Stiles was initially revealed to be joining the show. My guess? She’ll be a serial killer in training, sort of a protege for Dexter. Just a guess, of course, but that’s what I’m going with.