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Karl Arnold Sr. also known as The Fox is a major antagonist of the crime-drama tv series Criminal Minds. He is a serial killer that targets families and the titular main antagonist of the season episode The Fox. He returns in the season five episode Outfoxed when the BAU visit him in jail to consult him about a new string of family murders.

He is portrayed by Neal Jones.



As a child, Arnold was physically and sexually abused by his father, resulting in him developing a self-hatred. At some point in adulthood, he married a woman named Fay and had two children, Karl Jr. and Sarah. However, Arnold's obsessive-compulsive nature resulted in a divorce, during which Fay won full custody over the children. As a result, Arnold began drinking heavily and became unfocused.

Karl eventually worked as a family psychiatrist and family annihilator. He targeted families he viewed as dysfunctional, stalking them for weeks before attacking when they were supposed to go on vacation. He'd bypass the family alarm systems and kill the famil dog if they had one before abducting the family. He'd keep the family separated for days, during which he would assume the role as head of the household. Eventually, he would bring the family together and ultimately kill them all, starting with the children and ending with the father. Prior to the killings, he would beat the male children and rape the female children. After this, he would take the father's wedding rings as trophies.


The BAU was called to investigate after Karl had murdered eight families, mainly to investigate the disappearances of the Millers and the Crawfords. Karl was found in the basement of the Dunken's house, where he used the Dunken infant as a hostage. Karl eventually released the infant and attempted to flee, but was quickly captured and taken to BAU headquarters. At headquarters, the BAU tricked Karl into confessing his crimes by switching the places of two crime scene photos on the board; Karl couldn't stand anything being out of order, resulting in an outburst and a detailed confession to the murders. 


Karl returned in season 5, where he helped the team with a spree-killer case. During the episode, it was revealed that the legendary serial killer know as The Reaper was secretely working with Karl Arnold.



           Criminal Minds Logo Villains

Season 1
Adrian Bale | Bruno Hawks | Cally's Tribe | Clara Hayes | Cory Bridges | David Walker | Donald Curtis | Eddie Mays | Edward Hill | Jackson Cally | Jacob Dawes | L.D.S.K. | Maggie Lowe | Mark Gregory | Mary Mays | Pablo Vargas | Ted Bryar | The Fisher King | The Footpath Killer | The Fox | The Keystone Killer | The Seattle Strangler | The Tommy Killer | The Vigilante | Vincent Perotta | Vincent Shyer

Season 2
Amber Canardo | Carl Buford | Charles Holcombe | Frank Breitkopf | Jeffrey Charles | Kenneth Roberts | Marcus Younger | Michael Earlson | Paul and Johnny Mulford | Ronald Weems | Roy Woodridge | Sarah Danlin | Stripping Bandit | Terrance Wakeland | The Fisher King | The Hollow Man | The Mill Creek Killer | Tobias Hankel | Tony Canardo | Vincent Stiles | William Lee

Season 3
23rd Street Killers | Brian Matloff | Charlie Wilkinson | Francis Goehring | Gary and Ervin Robles | Glen Hill | Henry Frost | Jason Clark Battle | Jeremy Andrus | Joe Smith | Lucky | Mike Hicks | Owen Savage | Peter Redding | Richard Jacobs | Ryan Phillips | Stanley Howard | Steven Fitzgerald | Susan Jacobs | The Campus Killer | The Have-You-Seen-Me Murderer | True Night

Season 4
Adam Jackson | Animal | Armando Ruis Salinas | Benjamin Cyrus | Chad Brown | Chloe Kelcher | Claire Bates | Danny Murphy | Eric Olson | Floyd Hansen | Henry Grace | Hugh Rollins | Ian Coakley | Leo Kane | Lucas Turner | Mason Turner | Megan Kane | Paul Silvano | Robert Parker | Roderick Gless | Romani Family | Separatarian Sect | Steven Baleman | The Angel Maker | The Reaper | The Road Warrior | Tommy Wheeler | Vincent Rowlings | William Harris

Season 5
Anita Roycewood | Arthur Malcolm | Bill Hodges | Boyd Schuller | Connor O'Brien | Dale Schrader | Darrin Call | Earl Bulford | Gina King | Joe Belser | John Vincent Bell | Miranda Jakar | Owen Porter | Patrick Meyers | Prince of Darkness | Ray Campion | Robert Burke | Robert Johnson | Ronald Boyd | Samantha Malcolm | The Fox | The Reaper | The Reimanns | Tony Mecacci | Turner's Group | Wade Hatchett | Will Summers

Season 6
Bill Thomas | Drew Jacobs | Hollis Walker Jr. | Ian Doyle | James Barrett | James Stanworth | James Thomas | Jane Gould | Jeremy Sayer | Kaman Scott | Lee Mullens | Michael Kosina | Prince of Darkness | Ray Donovan | Rhett Walden | Shane Wyland | Steve | Sydney Manning

Season 7

Season 8
Carl Buford | Darlene Beckett | Ellen Russell | Jason Nelson

Season 10
Donnie Mallick | Hayman Vasher | Justin Leu | Leo Jenkins | Peter Lewis | Steven Parkett | William Pratt

Season 11
Mitchell Crossford | Peter Lewis

Season 12
Peter Lewis

Season 13
Peter Lewis

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