system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] During one of his crimes, the joker is shot and killed by a GCPD officer. How does Batman react?
gpt
If the cop justifiably shot the Joker to save himself or a bystander, Batman would investigate to ensure the Joker was really and truly dead, breathe a sigh of relief, and start planning for Joker's inevitable return from the dead.

If the cop just shot the Joker because hey, how many chances to murder the Joker are you gonna get, then Batman will treat him like any other murderer and make sure the evidence is gathered and presented in the hopes he'll be put in jail. Then he'll investigate to ensure the Joker is really and truly dead, breathe a sigh of relief, and start planning for Joker's inevitable return from the dead.