In fact, when Lithgow appears in "Dexter: Resurrection," it won't be his first time returning to the role. He plays the killer in a flashback in "New Blood," from the memories of the young Harrison (Jack Alcott).

Now David Dastmalchian has been cast as the guest role of Gareth in the revival series "Dexter: Resurrection." Read More: Sitcom Star Joins 'Dexter: Resurrection' as Possible Serial Killer At this point nothing more than Dastmalchian's character's first name is known,