Out of all the questions in the world, This is the biggest hot potato.
Like, you can't simply float to heaven, Or become non-existent, since well, when you think about it, it's just confusingly impossible!
I believe in two theories.
1.) You'll re-incarnate as another life form.
2.) Your body may be dead, but your consciousness "Is energy" So it can't possibly get killed.
Anyway, Discuss this complicated question.