Batman: A Death in the Family #[nn]

Synopsis

Jason Todd is spiraling out of control, and he decides to find his biological mother without Batman's help. He finally does track down his mother, a former associate of the Joker, but unfortunately, the Joker shows up during the reunion and beats Robin to death. Batman's quest for revenge brings him into conflict with Superman when the Joker reappears as an ambassador of Iran, with full diplomatic immunity. The twist to the story is that readers were encouraged to phone in with their vote as to whether Jason Todd would live or die.