Board Thread:Comics/@comment-7736895-20160823222412

Hi, I heard a while ago by a friend,about a one shot comic where Batman Dies and the joker takes on himself to kill the most iconic Batman's vilain then ends up committing suicide after he killed all of them, could you help me find what comic my friend was talking about ( cuz he didn't took the time to check the name) and tell me if, 1. it is actually a one shot, 2. if it's actually what's happening in the comic or if my friend embelished it 