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Official Site: Showtime

Arthur Mitchell, often referred to as the "Trinity Killer," is a fictional character and the main antagonist of the fourth season of the Showtime TV series Dexter; he is portrayed by actor John Lithgow as an unassuming church deacon and family man—who for 30 years has been living a double life as a serial killer. In the series, FBI agent Frank Lundy (Keith Carradine) dubs him the "Trinity Killer" because of a recurring pattern of three killings based on traumatic events during Arthur's childhood.

Arthur was a suburbanite who lived a double life as one of America's most prolific serial killers for three decades. He was originally thought by the FBI to be a mere "myth" chased by Special Agent Frank Lundy.

Mitchell's first murder was a young woman whom he killed inside a bathtub. She was sliced with a straight razor while putting her in a choke hold, and holding up a small mirror so that he can see her face as she dies. His second victim is a married mother of two, whom he kidnapped. He forced her, by threatening her husband and children if she does not comply with him, to fall from high above a carefully selected abandoned building to her death. His third victim is a father of two, whom he bludgeons to death with a hammer. At each site, he places a small sample of his sister's ashes and arranged the victim's arm to point at the ash. He has repeated this cycle in different cities all over the United States.

It is later discovered before these incidents Mitchell also kidnaps a young boy whom he dresses in cowboy pajamas and convinces to play with a train set in a recreation of his childhood. Following this, he will bury the boy alive in cement at a Four Walls building site. These killings were not connected to the pattern until shortly before Mitchell's death, because the boys were reported as missing rather than dead.

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