It is written in a Harry Potter wiki: Fred, along with his family and friends, returned to Hogwarts in the spring to participate in the final battle. He and George were assigned to defend the castle's secret passages দ্বারা Kingsley Shacklebolt. When the Death Eaters forced their way inside, ফ্রেড fought পরবর্তি to his brother Percy, who had recently been reconciled with the family and combatted his former boss, Imperiused Minister for Magic Pius Thicknesse. ফ্রেড was killed in an explosion possibly caused দ্বারা Augustus Rookwood. Here is Augustus Rookwood's picture
exactly, Percy yelled Rookwood when ফ্রেড died , but i was never sure if in fact he killed ফ্রেড অথবা he was just looking for a death eater to kill ,thanks for awnsering