Spoiler: -What killed Voldemort?-

[June Ewing]

> Michelle:
> My view was that each of the horcrux's destruction made him weaker
> and the final battle just finished him off.. I want to go watch
> the movie again tomorrow night.

June:
I did notice that last night when I watched it in 3D. This movie is
clearly best in 3D because you notice more. Also you are correct, he
did get weaker every time a horcrux was destroyed, including when the
horcrux Harry was destroyed. He had fallen at that point.