The boxing world reacts to the death of Marvelous Marvin Hagler

Marvelous Marvin Hagler, one of the best middleweights in boxing history, died on Saturday at the age of 66. K. Y. Cheng/South China Morning Post via Getty Images

Marvelous Marvin Hagler died at the age of 66 on Saturday. The Boxing Hall of Famer and sports icon was known as one of the best middleweight fighters in the sport's history.

Hagler became the undisputed middleweight champion in 1980 and defended the crown 12 times until his defeat against "Sugar" Ray Leonard in 1987. That was Hagler's last professional fight, ending his career with a record of 62-3-2 and 52 KOs. In 1993, Hagler was inducted to the International Boxing Hall of Fame. He was also selected as the fighter of the decade in the 1980s.

Hagler is also remembered for what is often known as the greatest three minutes in the sport: the first round of his fight against Thomas Hearns. Hagler ended up winning that 1985 bout by third-round TKO.

Fighters, promoters and others from the boxing and sports world took to social media to pay their respects to one of the all-time greats.