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John Lithgow Joins \"Dexter\"

John Lithgow's latest role is certainly one to die for; the actor has taken a role on Showtime's \"Dexter.\"\n\nAccording to Newsday, Lithgow will appear in all 12 episodes this season. He will play Walter Simmons, a serial killer. According to Showtime, he is \"an unassuming, mild-mannered suburbanite who has been living a dual life as one of America's most prolific and deadliest serial killers. Dubbed the 'Trinity Killer' because of his proclivity to kill in threes, he relocates to Miami after being tracked by FBI Special Agent Frank Lundy (Keith Carradine).\"\n\nOf course, \"Dexter\" (Michael C. Hall) will also be brought in on the case. Well, duh!\n\nLithgow spent six seasons starring on NBC's \"3rd Rock from the Sun.\" He recently returned to TV for the short-lived 2006 sitcom, \"Twenty Good Years.\"\n\n\"Dexter\" kicks off its fourth season on Showtime starting September 27. -- Rachel Cericola\n