John DeMarco

John DeMarco was a crooked member of the Gotham City Police Department's SWAT division, as well as a murderer.

History
John DeMarco was one of the corrupt cops in the Gotham City Police Department, acting as a member of the SWAT division. He was convicted with and proven guilty of drug use, and was apparently placed in jail for a few years. By Christmas, due to internal affairs planning to investigate his unit, as well as one of his teammates, Nate Ramo, planning to undergo a plea bargain exposing his unit's corruption (as IAD lacked sufficient evidence to expose his unit otherwise), DeMarco decided to silence him by ramming him with his car. However, the Blizzard during this time forced him to lose control of the vehicle and crash near the GCPD building after successfully conducting his hit-and-run. DeMarco eventually managed to flee before the GCPD managed to investigate the crime, as well as searched Ramo's house for anything incriminating about his unit. Batman, learning of the hit and run from a Police Dispatch by Officer Meyer, investigated the murder and deduced DeMarco's role due to residue paint from DeMarco's earlier crash (as his car carried a distinctive paint job). DeMarco then reconvened with his SWAT unit, although they were aghast that he did the hit and run in front of the GCPD, as that made their corruption more than certain, but DeMarco was confident that they'll be back at work after the investigation was over. Unfortunately for him and his unit, Batman had tracked him down to their meeting area and proceeded to subdue him. Batman then interrogated him, and proceeded to inform him that since he committed murder on a fellow officer, that means his prison sentence has increased to life imprisonment, although DeMarco implied that he'll try to have one of his friends remove the evidence and ensure he goes scot-free. Batman, having taped his confession and vowed that he will ensure the evidence won't disappear, then leaves him and his unit to be apprehended by the GCPD, also having Alfred send the taped confession to them as well.