DC officially retired the hero in the one-shot comic Batgirl Special #1 (July 1988), written by Barbara Kesel .  Later that year, she appears in Alan Moore's Batman: The Killing Joke . In this graphic novel, the Joker shoots and paralyzes Barbara Gordon in an attempt to drive her father insane, thereby proving to Batman that anyone can be morally compromised. While the events in The Killing Joke exert a great impact on the character, the story has little to do with her.  She is deployed as a plot device to cement the Joker’s vendetta against Commissioner Gordon and Batman. In 2006, during an interview with Wizard , Moore expressed regret over his treatment of the character calling it "shallow and ill-conceived".  He stated prior to writing the graphic novel, "I asked DC if they had any problem with me crippling Barbara Gordon—who was Batgirl at the time—and if I remember, I spoke to Len Wein , who was our editor on the project", and following a discussion with then-Executive Editorial Director Dick Giordano, "Len got back onto the phone and said, ‘Yeah, okay, cripple the bitch.'"