Burton's co-star Carl Weathers confirmed the news in a tweet on Thursday.
"E_Woodyard @TheSlyStallone Sad news. RIP Tony Burton. His intensity and talent helped make the Rocky movies successful. #BePeace," Weathers wrote on Twitter.
According to MLIve, Burton's younger sister Loretta Kelley also confirmed the news and said that the actor had intermittently spent time in the hospital over the last year, but was never given an official diagnosis.
Rest in Peace, Tony https://t.co/l9pzR65eCc— MGM Studios (@MGM_Studios) February 26, 2016
RIP Tony Burton. You'll make some hurtin' bombs in the hereafter. https://t.co/Ji4vhuAhst— Nick Michalak (@RavensFilm) February 26, 2016
RIP Tony Burton from the Rocky movies pic.twitter.com/hS50SDVnhK— Daniel (@Danielmmafan) February 26, 2016
Before going into acting, Burton reportedly won two Flint Golden Gloves light heavyweight titles, before doing a short stint as a professional boxer.
Following news of his death fans took to Twitter expressing their sorrow.