Scottish boxing legend Ken Buchanan has passed away at the age of 77.

Buchanan became the undisputed world lightweight champion in 1971 and won his first 33 fights.

The Ken Buchanan Foundation announced his passing on social media.

"It´s with great sadness that we have to inform you that Ken Buchanan passed away peacefully in his sleep this morning. Further announcements will come and please give the family some time to process this sad news. RIP Ken, always a gentleman and one of the best champions we will ever see."

In 2022, a statue of Buchanan was unveiled in the boxer's home city of Edinburgh.

Last year, Buchanan´s son revealed that his father was suffering from dementia and living in a nursing home.

Buchanan retired from the sport in 1982, after suffering his fourth consecutive decision loss. He finished his career with a record of 61 wins, 8 defeats, and 27 wins by knockout.

In 1970, he captured the WBA lightweight title in 1970 by defeating Ismael Laguna. A year later, he beat Ruben Navarro to capture the WBC title.

He would eventually get stripped of the WBC title after not making a defense against Pedro Carrasco. And lost the WBA strap to another legend, Roberto Duran.