Martin "Mad Dog" Hawkins was a serial killer-turned-patient of Arkham Asylum during the institute's opening years.
While not appearing visually in the game, Martin Hawkins was discribed via the Chronicles of Arkham and present via an etching on a plaque before a vandalized statue of Amadeus' wife, Constance Arkham.
From an early age, Martin Hawkins was beaten and sexually abused by his father. Hawkins grew up to become a disturbed man who cut himself in order to feel something. One day, as he was driven further into insanity, Hawkins claimed to see visions of the Virgin Mary, who told him to go out and kill women, by destroying their faces and sexual organs in order to "stop the dirty sluts from spreading their disease."
When Amadeus went back to Gotham City and set up Arkham Asylum, he went back home to find that Hawkins had broken into his house, dismembered his wife, and had raped his daughter before he decapitated her and put her head in a dollhouse.
Hawkins was captured again and sentenced to Arkham Asylum, where he took great pleasure in taunting Amadeus by calling his daughter a slut and told him about the murder in graphic detail. Amadeus listened to the taunts and took them in his stride until after an incident when Mad Dog, about to be released into the public once again, used the pen that he was given to sign his release form and killed Amadeus's secretary.
On the anniversary of the murder, Amadeus strapped Hawkins to a shock therapy table and fatally electrocuted him, and got revenge for the deaths of his wife and daughter. Hawkins' death was treated as an accident while Amadeus himself was admitted into his own asylum.
- Martin Hawkins first appeared in Arkham Asylum: A Serious House on Serious Earth (October 1989)
- The decapitation of the statue of Constance Arkham could be a reference to how Hawkins decapiatetd Arkham's daughter and stuffed her head into a doll house in the comic Arkham Asylum: A Serious House on Serious Earth, it's also said that he raped her in the comic, but both those details are omitted from his backstory in the Arkham games.