Jennifer Leann Carpenter (born December 7, 1979) is an American actress. She is best known for playing Debra Morgan on the Showtime drama series Dexter, for which she won a Saturn Award for Best Supporting Actress on Television in 2009.
Carpenter first attracted critical attention for her performance in The Exorcism of Emily Rose. She took home the 2006 MTV Movie Award for 'Best Frightened Performance', and also received a 'Hollywood Life Breakthrough Award'. She was also named 'Breakout Performer' at the 2006 Scream Awards.
Carpenter currently plays the role of Debra Morgan in the Showtime crime drama television series Dexter which premiered October 1, 2006. Her portrayal of the title character's sister has impressed some critics, with Australian journalist Jack Marx describing her portrayal of "cool and clumsy" Debra as "so perfect that many viewers appear to have mistaken the character's flaws for the actor's."
In 2011, she starred in the Off-Broadway play Gruesome Playground Injuries at Second Stage Theatre and made a guest appearance on the CBS drama The Good Wife.