Dr. Rudolph Klemper was arrested for the serial killing of senior citizens and was put on trial by DA Harvey Dent. Klemper was found to be innocent but revealed to Dent that he was able to control a double personality and maintain his innocence. Dent began his descent into madness and killed Klemper.
Dent began a professional relationship with Batman to increase the conviction rate of Batman's collars, but Batman didn't like the methods Dent wanted to begin employing. The trial for Boss Maroni was beginning and Maroni was putting pressure on Dent, to no avail. Eventually, Maroni had acid smuggled into the court-room and splashed it on Dent during the trial, completing Dent's turn into Two-Face and madness.
