Arthur Mitchell (Dexter)

Arthur Mitchell
Dexter character
John Lithgow as Arthur Mitchell
First appearance"Living the Dream" (2009)
Last appearance"A Beating Heart..." (2025)
Portrayed byJohn Lithgow
In-universe information
Occupation
  • High school teacher
  • Charity volunteer
  • Church deacon
Family
  • Henry Mitchell (father; deceased)
  • Marsha Mitchell (mother; deceased)
  • Vera Mitchell (sister; deceased)
SpouseSally Mitchell (wife; deceased)
Children
  • Christine Hill (daughter; deceased)
  • Rebecca Mitchell (daughter; deceased)
  • Jonah Mitchell (son)

Arthur Mitchell, also known as the "Trinity Killer", is a fictional character and the main antagonist of the fourth season of the American Showtime television series Dexter. Arthur is a serial killer who presents himself as an unassuming church deacon, high school teacher and family man. He kills to suppress his childhood trauma derived from accidentally causing his sister's death and ruining his family. Frank Lundy (Keith Carradine), an agent of the Federal Bureau of Investigation, dubs him the "Trinity Killer" because of a recurring pattern of three killings based on traumatic events during Arthur's childhood. He is portrayed by John Lithgow.

Lithgow's performance was widely praised. He won a Golden Globe Award and a Primetime Emmy Award for his performance. In 2016, Rolling Stone ranked him #34 of their "40 Greatest TV Villains of All Time". IGN ranked him #57 of the "Top 100 Villains".

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