2013: Former boxing champion Ken Norton, who rose to the top of the boxing world in 1973 by outdueling Muhammad Ali, dies at age 70 in Henderson, Nevada. Norton had been in poor health for several years after sustaining a series of strokes. He was best known for his 12-round victory over Ali on March 31, 1973, when he famously broke Ali's jaw. With the victory, he became only the second man to defeat a peak Ali as a professional (after Joe Frazier, who won a 15-round unanimous decision against Ali in 1971). Norton and Ali would fight twice more, with Ali narrowly winning both return bouts. Norton also went on to briefly hold the World Boxing Council heavyweight title in the late 1970s, being awarded the title when Leon Spinks refused to fight him as a mandatory challenger in favor of a rematch with Ali, whom Spinks had beaten for the title. Norton lost the WBC title in his first defense of it, a 15-round split decision loss to Larry Holmes in 1978.