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
Captain María Esperanza del Alma LaGuerta ( or ; ), is a fictional character in the Showtime television series "Dexter". The character is known as Migdia LaGuerta in the novels by Jeff Lindsay upon which the television series is based. She was portrayed by Lauren Vélez in the television series. She is a lieutenant (and later captain) in the fictitious Miami-Metro Homicide Department, and the superior officer of Dexter and Debra Morgan.