If you are looking for the comic where Batman dies, you are thinking of Batman 681. The story is Batman R.I.P. I may have deceived you a little bit. Batman doesn’t really “die”, but did I really have to tell you that? Just like Superman didn’t really die, or Spider-Man didn’t really die.
The story goes as follows: a group called The Black Glove aim to break Batman mentally, and they find a way to “switch off” Batman. However, there is a subconscious Batman that was put in place in Bruce Wayne’s mind in the case of a mental attack. He calls this the Batman of Zur-En-Arrh. So even if you break Batman’s mind, he will still be Batman, because there is a Batman behind the Batman. If this sounds somewhat ridiculous to you, I hear you loud and clear.
Long story short, Batman, Robin, and Nightwing get screwed over and Batman punches through a helicopter window, which causes it to crash into water. This is where Batman dies. Quote unquote. Because a vague accident that happens over the pillow-like cushion of water must mean certain death. Other fun things happen, like Alfred getting the tar kicked out of him, and Batman getting buried alive in a coffin. How does he get out of the coffin? He simply pushes up on it and gets out. I’m not kidding.
I have read better Batman stories, but this one isn’t bad. If you are curious, you should definitely give Batman R.I.P. (affiliate link) a read, because it’s so cheap. As a bonus, you will get to see Batman dressed up in a homemade colorful costume he sewed while living on the street. Comment.