Supernatural - Nightshifter Season 2 Episode 12

Sam and Dean investigate a string of bank robberies with disturbing similarities. In each robbery, a top-notch employee holds up and robs the bank, then commits suicide. But when autopsies show that their time of death was days before the robbery, the Winchesters discover that a shape shifter is at work bringing them face-to-face with an enemy of the past.