Ali died Friday at a Phoenix-area hospital, where he had spent the past few days being treated for respiratory complications, a family spokesman confirmed to NBC News. He was 74.Muhammad Ali was an American professional boxer, generally considered among the greatest heavyweights in the history of the sport. 1 Ali vs Foreman 2 Ali vs Liston II 3 Ali vs London 4 Ali vs Bonavena 5 Ali vs Wepner 6 Ali vs Ellis 7 Ali vs Blin 8 Ali vs Folley 9 Ali vs Patterson 10 Ali vs Mildenberge