Here's some interesting news from ComingSoon.net

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Rowling Says A Harry Potter Character Will Die
Source: J.K. Rowling
October 8, 2004

"Harry Potter" author J.K. Rowling said on her official website that one of the characters will not survive the full series of books about the young wizard.

Asked whether she planned to kill off any more characters, Rowling replied, "Yes, sorry." But she refused to identify the character. It is unclear whether the death will occur in Harry Potter and the Half-Blood Prince, the sixth book in the series due to be published next year.

Rowling has previously said Harry Potter himself will survive until the seventh and final book in the series, but she did not say whether he will reach adulthood. "You have to wait and see whether he survives to be a grown-up," Rowling said in August.

Rowling publicly stated before the publication of her last installment, "Harry Potter and the Order of the Phoenix," that a major character would die in that book as well, though we won't reveal who here.