Capes, 75, won two Commonwealth titles, twice won the World’s Strongest Man competition, and competed for Great Britain in the shot put at three Olympic Games.
It is unknown what caused his death.
Olympic javelin thrower Tessa Sanderson said: “I just learned of Geoff Capes’ tragic death, sweet Jesus. Geoff added a lot to GB athletics and was a lot of fun for the team.
“My deepest sympathies to his family. Rest in peace, Geoff Capes. He was a wonderful person and an outstanding athlete.
Capes was described as a “giant in heart and spirit” and a “true legend” by former strongman Eddie Hall.
He continued by saying: Geoff was a role model for many of us as children, a man whose remarkable accomplishments and moral qualities made a lasting impression on the strong community.
Around the world, his legacy will continue to motivate the upcoming generation of sportsmen and strongmen.
On X, British Athletics expressed their sadness at learning of his demise. According to a family statement, Geoffrey Capes’s family would wish to inform of his untimely death today, October 23.