Criminal Minds Wiki

"Brothers in Arms" is the tenth episode of Season Four and the 75th overall of Criminal Minds.


As a former cop, Morgan takes it personally when a serial killer specifically begins targeting officers working in the police force in Phoenix, Arizona.

Guest Cast

Bookend Quotes

  • Derek Morgan: "We are all brothers under the skin and I, for one, would be willing to skin humanity to prove it." – Ayn Rand [writing as Elsworth Toohey in The Fountainhead]
  • Derek Morgan: "For he today who sheds his blood with me shall be my brother." – William Shakespeare


  • Mark Pellegrino, who portrays Lieutenant Evans, previously portrayed mass murderer Dick Hickock in the 2005 movie Capote.
  • Doug Jones, the actor who portrays Beanie, previously appeared on Criminal Minds, starring as drug-addicted robber and murder suspect Domino Thacker in the Season One episode Blood Hungry.
  • Roberto Sanchez, the actor who portrays Sergeant Manny Rodriguez, previously appeared on Criminal Minds, starring as a SWAT agent in the Season One episode The Fox.
  • Despite being credited in the opening sequence, A.J. Cook, who portrays JJ, doesn't appear in the episode. This is actually the 4th of 29 episodes in which characters are credited despite not appearing in the episodes. The others are:
  • 3-1-1, a real-life telephone number that is used in some locales to connect callers to municipal services in non-emergency situations (e.g., if someone wants to make a noise complaint), is shown alongside its emergency counterpart 9-1-1 on a police car.
    • Phoenix, Arizona, currently does not offer 3-1-1 services in real life.


  1. Credited as "Fight Club Captain"

Criminal Minds Episodes