Finn was an FBI Agent and close friend and partner of FBI Agent Robert Nightingale. Finn and Nightingale were known as "The Righteous Brothers", as they never drank or went against the rules. When Finn started talking about "darkness" and avoiding shadows whenever he could; Nightingale told him to get his act together. Sometime later he was "taken" by something and Nightingale became obsessed with finding out what Finn had meant by the 'darkness'. After that Nightingale started to drink heavily to cope with his guilt over his friend's evident death.