Jennifer Carpenter
Jennifer Leann Carpenter (born December 7, 1979) is an American actress. She is known for playing Debra Morgan, the adoptive sister of the title character of the Showtime series "Dexter", for which she earned a Saturn Award in 2009, and also for playing Rebecca Harris in the CBS television series "Limitless".
María LaGuerta
In the novels, LaGuerta's first name is "Migdia". In "Darkly Dreaming Dexter", LaGuerta is portrayed as a spiteful, manipulative woman skilled only in political gamesmanship. In the TV series, however, she is cast in a more sympathetic light. In both the novel and the TV series, she flirts semi-openly with Dexter, much to his annoyance. In the first book, LaGuerta is stabbed to death by Dexter's brother Brian; in the TV series, LaGuerta remains alive and very much a factor in Dexter's life until her death at the end of Season 7.