Sid Eudy, a former champion in WWE known as “Sycho Sid,” has died at the age of 63 after a prolonged struggle with cancer, as announced by his son on Monday.

“It pains me deeply to announce that my father, Sid Eudy, has departed after years of fighting cancer. He was a remarkable person full of strength, kindness, and love; he will be profoundly missed,” Gunnar Eudy expressed in a Facebook post. “We are grateful for your prayers and thoughts during this difficult time.”

Beginning his wrestling career in the late 1980s, Eudy had a brief stint as part of Ric Flair’s famed group “The Four Horsemen” before joining WWE (formerly WWF) in 1991. With his strikingly large build and a wild persona, Eudy quickly gained prominence, highlighted by a noteworthy fight in the 1992 Royal Rumble that ignited a rivalry with Hulk Hogan. This rivalry led to one of the main events at WrestleMania 8 later that same year in Indianapolis’s Hoosier Dome.

After exiting WWE for a period, Eudy made a comeback in 1995, unveiling his famous “Sycho Sid” character the following year. He captured the WWE Championship for the first time at the Survivor Series in 1996 by defeating Shawn Michaels. Eudy regained the title in 1997 and defended it against The Undertaker at WrestleMania 13, which saw The Undertaker triumph in his legendary streak. He eventually left WWE again that same year. Eudy also competed in WCW and endured a severe leg injury in 2001 that nearly ended his wrestling career. His final appearance in WWE was in 2012.

Throughout his wrestling journey, he earned the title of WWE champion twice, WCW champion twice, and also held the United States championship.

“Sid was one of the most formidable and fearsome competitors of his generation, possessing a natural charisma that instantly resonated with the WWE fans,” WWE stated in a tribute. “Known as ‘The Master and Ruler of the World’, Sid’s legacy as one of the toughest and most exciting Superstars remains influential in wrestling around the globe.”