S4·E2 Torment

When a young prostitute is found dead, clinical psychologist Dr. Tony Hill sees an immediate parallel with the crimes committed by an incarcerated serial killer, Derek Tyler. There can be no doubt that Tyler is innocent of the most recent crime but the similarities - the women were all blond, young, bound to the bed and cut until they bled to death - cannot be ignored. Tyler was diagnosed as a paranoid schizophrenic but Tony soon realizes that he wasn't hearing voices telling him to commit the murders but rather was taking instructions from someone. The case becomes ..