Augustus Rookwood is Voldemort's spy in the Department of Mysteries in the Ministry of Magic. He was caught and sent to Azkaban after Igor Karkaroff (an ex-Voldemort supporter) revealed Rookwood's identity to a former Wizengamot to free himself from Azkaban. Rookwood killed Fred Weasley in the Battle of Hogwarts in Harry Potter and the Deathly Hallows.
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George Weasley wasn't killed, he survived the series. Fred Weasley was killed in an explosion most likely caused by Augustus Rookwood.
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.
Sherman Augustus is 6' 1".
Augustus Carney died in 1920.
Augustus Siebe was born in 1788.