Sonny Liston was an American professional boxer often viewed as ‘the invincible one’ in the ring. His deadly record of 54 wins out of 58 bouts clearly supports the aforesaid statement. His journey toward becoming a professional boxer began in ‘Missouri State Penitentiary,’ where he was sentenced for five years. He began his professional career in 1953. Known for his hard hits and punches, Sonny became the ‘World Heavy Weight Champion’ in 1962, after knocking out his opponent, Floyd Patterson, within three minutes. He remained the champion for 17 months before he was defeated by Cassius Clay, later known as Muhammad Ali, in 1964. A year later, he had a rematch with Clay where he was knocked out in the first round again. However, he made a comeback with 11 consecutive knockout wins. Sonny was found dead on January 5, 1971 at his Nevada residence. Heart failure and congestion in lungs were cited as cause of his death in the official report.