The Twilight Saga screenwriter Melissa Rosenberg,and explained the inclusion of Victoria as the reason for Harry Clearwater’s death in an MTV interview:

“In the book, Harry Clearwater’s death, heart attack is mentioned as something that’s off screen, although it plays a crucial role in the structure of the books,” said Melissa. “Reading that it was Harry Clearwater’s heart attack it just gave me the idea of, why don’t we see this? Stephenie [Meyer] doesn’t specify what caused the heart attack, so I decided, well, you know, if could be caused by something startling him. It could be caused by fear.”

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OMG i am only conting down the months until Eclipse and here it is days, hours, minutes, and seconds.