Murphy worked under James Gordon in the Major Crimes Unit of the Gotham City Police Department. He was present when Harvey Dent falsely identified himself as the secret identity of the Batman and was led into an armoured car. Later, he was at the MCU when the Joker broke out of his cell with Gerard Stephens as a hostage. Murphy pointed a gun at the clown, who demanded his phone call, so Murphy threw him a mobile phone. The Joker made a call to a cell phone connected implanted an explosive implanted into his henchman Kilson's belly, setting the device off in an explosion that ripped through the building, allowing the Joker to escape with Lau. It is unknown whether Murphy survived as he was not seen again afterwards.
Murphy was present in The Dark Knight, although he was only identified in the novelization's version of the events.