Muhammad Ali (Cassius Marcellus Clay, Jr., January 17, 1942 – June 3, 2016) was an American professional boxer, generally considered the greatest heavyweight in the history of the sport. Early in his career, Ali was known for being an inspiring, controversial and polarizing figure both inside and outside the boxing ring. He is one of the most recognized sports figures of the past 100 years, crowned "Sportsman of the Century" by Sports Illustrated and "Sports Personality of the Century" by the BBC. He also wrote several best-selling books about his career, including The Greatest: My Own Story and The Soul of a Butterfly.
Ali was diagnosed with Parkinson's syndrome in 1984, a disease that commonly results from head trauma from activities such as boxing.
Ali was hospitalized on June 2, 2016 with a respiratory condition. His condition was initially described as "fair". The following day, Ali's condition worsened, and he was placed on life support. His condition did not improve, and late on June 3, it was announced that Ali had died at the age of 74.