Tags: Television Season.
On October 21 2008 Showtime commissioned a fourth and fifth season of Dexter each 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. On May 27 2009 Showtime announced that John Lithgow would guest star in all 12 episodes as Miami’s latest and deadliest serial killer and Keith Carradine would return as Lundy.