Assassin is the fifth episode of the second season. It was released on 21 October 2005.

Charlie sees a whole new version of following in family footsteps when he and Don are called in to uncover the identity of a professional assassin. The target is one Gabriel Ruiz, the scion of a Columbian family with a history of publishing the truth, irrespective of the risk. Gabriel has no intention of tarnishing the family honor, or going into hiding, which, though very noble, massively complicates the FBI's task. Charlie struggles to quantify the factors in Gabriel's decision, an unusual experience in itself, for him.


'Assassin' is derived from the Arabic 'hashishayya', those who stand apart from society, the cullers, guard dogs and perhaps necessary evil.