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".
Dex Dexter
Dex has been casually involved with Leslie Carrington, but their relationship ends when Leslie has a fling with Jeff Colby and goes to work for Alexis. Dex develops a friendship with Jeff's ex-wife (and Blake's daughter), Fallon. In episode 187, Fallon asks Dex to help her investigate a business deal in Africa, where he discovers that the key contact there, Harry Thresher, has ties to Alexis's new husband, Sean Rowan. Dex grows more suspicious and tries to warn Alexis, who dismisses his warnings as jealousy. In episode 194, Leslie confesses to Dex that she has been sleeping with Sean, and learned that he is seeking to destroy Alexis in revenge for the suicide of his father, Joseph Anders, which he believes was caused by Alexis. Dex warns Alexis who fears the worst.