Arthur Mitchell / The Trinity Killer, played by John Lithgow, delivers some of Dexter's most memorable lines. Below are 4 of the best Arthur Mitchell / The Trinity Killer quotes from Dexter, each with the scene or episode where it appears, plus 4 pieces of trivia about the character.
Best Arthur Mitchell / The Trinity Killer Quotes
"It's already over."
— Arthur Mitchell / The Trinity Killer, Season 4, Episode 12 - The Getaway (to Dexter, after killing Rita)
"I've been able to contain it. All these years. How do you do it?"
— Arthur Mitchell / The Trinity Killer, Season 4 - to Dexter, about their shared urges
"You can't stop. Just like me."
— Arthur Mitchell / The Trinity Killer, Season 4 - to Dexter
"I have a family!"
— Arthur Mitchell / The Trinity Killer, Season 4, Episode 5 - Dirty Harry
Arthur Mitchell / The Trinity Killer Trivia & Fun Facts
- John Lithgow won the Emmy for Outstanding Supporting Actor in a Drama Series for his portrayal of Arthur Mitchell, beating out his co-star Michael C. Hall.
- The Trinity Killer's ritualistic murder cycle — always targeting three specific victim types before killing a fourth — was based on real-life serial killer patterns studied by the show's writers.
- Lithgow described playing Arthur Mitchell as one of the most challenging and disturbing roles of his career due to the character's extreme duality.
- Season 4 is widely regarded as Dexter's best season, with the Dexter-Trinity dynamic cited as the reason — two monsters who see themselves in each other.
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Read the full Arthur Mitchell / The Trinity Killer character profile or browse all Dexter quotes.