'Dexter's final season is officially final. It's officially official! Yes, at long last, Showtime has definitively confirmed that the upcoming year for everyone's favorite serial killer will indeed be the last, bringing an end to the eight-year series staring Michael C. Hall and Jennifer Carpenter. To commemorate the news, Showtime has even released a full-length clip form the new season featuring a crazed Deb, so what are you waiting for? Preview 'Dexter's final season inside!