How The Trinity Killer Can Return In The Dexter Revival

John Lithgow won an Emmy for his frightening work as Mitchell and was arguably a pivotal character on the show, a foil for Dexter who could seemingly balance his double life as a serial killer with his role as a husband and father. In some ways, Dexter finally found someone he could relate to as a person, at least when it came to his most primal desires and the justifications for his actions. By killing Rita, however, the Trinity Killer — an abusive man toward his own family — put an end to Dexter's dream of "having it all" as both a murderer and family man. Dexter kills Mitchell and the Trinity Killer persona along with him, but Dexter's inner peace is still years away.

We can speculate about how Arthur will return to the show, but Lithgow apparently is only working for about a day on the set, per Deadline. If this is the case, it would seem that his character won't be a consistent presence during the revival. We also don't expect him to portray someone other than Mitchell, as the Trinity Killer is still one of the most unsettling characters in all of TV. There must be a specific reason that Lithgow has rejoined the show, and for this, we need to look deeply into the personality of Dexter.