What's the difference between a baby's head and an apple? One's harder to bite into
Are you sure that's funny? Are you making fun of the victims of violence? I hesitate to laugh, those are unkind words.
It's just a joke, chill out.
You should never joke about what happens to victims of any violence, this will make anyone gasp. Your statement should have some form of real humor, and if you can't understand that then put yourself in the place of a victim's family member.
It doesn't hurt to ask. Some jokes are not funny but I think it'll be fine.
It shouldn't matter if its funny or not. You shouldn't tell jokes that trivializes harm.