Spoiler: -What killed Voldemort?-

[Steve]

I mentioned this in another discussion, but I thought I would present is as an isolated question.

According to your viewing of the movie -

What killed Voldemort?

That precise moment was so underplayed in the movie that it wasn't clear after two viewings.

Did he die because Neville killed the Snake, the last Horcrux?

Did he die from his own rebounding curse?

Did Harry's curses, or some other aspect of Harry's efforts, kill him? 

It was odd that the light connecting the wands, just stopped, then Voldemort turned to ash, implying that he was dead. But I'm still not sure of what the source or cause of Voldemort's death was, at least, not from the movie.

Thought?

Steve/bboyminn