It has to be a lucid dream, because then you can stop it, but you didn't...

But, whatever.
We'll say any dreams.

So i'll count in disappearing, turning to dust, exploding, getting poisoned, burning, choking and dying for no apparent reason.

Edit:
Originally posted by Leo Volont

So, it would seem that anybody who has a Lucid Dream of being killed is somehow missing one of the most important lessons in Dreaming -- that one cannot die in a dream.
I ment like, semi-dying and waking up because your brain can't really simulate it properly.

Or...Something.
Did i mention bleeding because my sister ripped out my eye, by the way?