After Harry, Ron, and Hermione had destroyed the diadem, they ran into Fred and Percy in the halls. They were fighting Death Eaters. Percy was newly reconciled with the family and was cracking jokes along with Fred. Fred was laughing and commenting that he hadn't heard Percy laugh or joke in ages. There was an explosion and the side of the castle was blown away. Hermione and Harry were lifted and blasted into one direction. When they recovered they heard screaming. Ron, Fred, and Percy were against another wall. Percy had realized the explosion had killed Fred. He stayed trying to protect his dead brother and had to be pulled away to continue fighting. It was never stated who caused the explosion. He dies because the author chose him to die. She has no current reason for this action
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No, he was injured by a curse and lost his ear. It was his twin brother Fred who was killed.
No, he survived. Although he was attacked by Fenrir Greyback and left scarred for left. However, one of his younger brothers was killed in the last battle with Voldemort in the seventh book, Harry Potter and the Deathly Hallows.
In every single book, starting in the train station when Harry Potter couldn't find platform nine and three quarters.
Neither of them do. Dobby, Mad-Eye Moody, Hedwig, and Lord Voldemort die, though.
There is no Fred Buuer in Harry Potter. You may be thinking of Fred Weasley, twin brother of George Wealsey and older brother to Ron. Fred Weasley dies in the end of the seventh book. He died at age 20 by an explosion caused by death eater, Augustus Rookwood while fighting alongside his older brother Percy inside the Hogwarts castle.