Will Harry or Lord Voldemort die in the final battle of the 7th book?

Nobody can be sure but it makes sense to have Harry Sacrifice himself to save his friends and kill Voldemort. Especialy since if Harry dies, no other author can do a spinoff of the book. Did you know that JK Rowling said she wrote the last chapter before she finished writing the first book. PS: She originally planned to kill Harry, but she changed her mind alot.