Kevin Sullivan,John Caldwell better known to professional wrestling fans as "The Taskmaster," who became one of the sport's great villains and later carved out a role as a booker creating intriguing storylines, has died at the age of 74.

A cause of death was not reported, but in May his family had set up a GoFundMe request, saying that Sullivan had "suffered a devastating accident" and "underwent emergency surgery that saved his leg and life but faced severe complications, including sepsis and encephalitis."

During his lengthy career, Sullivan had major battles with other legends such as Hulk Hogan, Dusty Rhodes, and The Road Warriors.

"Kevin Sullivan had one of the most unique minds in the history of our industry, pushing creative boundaries and developing some of the most intriguing characters to step into the ring. He had an unwavering passion for what we do. My thoughts are with his family, friends & fans," WWE executive Triple H said on social media.

During his early tenure with World Championship Wrestling, Sullivan, who was originally from the Boston area, formed the Varsity Club, Army of Darkness and the Dungeon of Doom, feuding with some of the sport's biggest names.