You put a character death warning in whenever any character dies. I'm not quite sure what differentiation you were looking for.
What I meant was do you put it on your story when you mentioned that two years ago, Harry died, or something like that, or do you put it on your story if you show the scene where Harry dies. Or both. But I get it now, thanks!

I've got another question: Does BETA stand for anything? If not, why is it usually capitalized?