Which Robin Story Was Too Dark For Batman: The Animated Series?

Jason Todd is considered one of the most hated characters in DC Comics. However, that doesn't make his death any less disturbing, especially when the Joker becomes much more aggressive in his torture. 

Upon seeing the Joker harm him in a way that will certainly kill him, Harley starts to have second thoughts. She is thrown out of the warehouse, but this buys her time to find Batman. 

Batman arrives in time to stop the Joker, but a fiery inferno threatens the lives of everyone in the warehouse. Jason pleads with his mentor to kill the Joker and end it once and for all, but Batman sticks to his principles. He saves his nemesis, and in his attempt to stop Batman, Jason causes the fire to spread. He ends up being swallowed by the explosion. 

Batman tries in vain to find his body but must conclude that his student has lost his life.