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



  1. Credited as "Fight Club Captain"

Criminal Minds Episodes