If Harry had died at the last book then who you think should had killed Voldemort?
http://www.ranker.com/list/who-should-have-killed-voldemort-if-harry-died-/humbertoibarra,
Arthur Weasley
William Weasley
George Weasley
Professor Horace Slughorn
Luna Lovegood
Professor Minerva McGonagall
Neville Longbottom
Percy Weasley
Ronald Weasley
Kingsley Shacklebolt