The fourth season of Dexter premiered on September 27, 2009, and concluded on December 13, 2009. The series was renewed for a fourth and fifth season in October 2008, with each season consisting of 12 episodes. The show's writers convened during February and March 2009 to brainstorm ideas for the fourth season, and filming was scheduled to begin in June 2009. In May 2009, Showtime announced that J... Wikipedia