Boxing legend Dave 'Boy' Green has resigned his seat on Fenland District Council because of ill health.
A by-election will take place on June 7 for the Birch ward, which Mr Green won three years ago, taking over from former council leader Alan Melton.
In the past year Mr Green has been poorly and unable to attend many meetings.
It is thought that Mr Green felt it was right to resign now and pave the way for a newcomer. His likely Conservative replacement is Ian Benny, a well known local businessman.
Mr Green, from Chatteris, secured two shots at the welterweight world title against Carlos Palomino and Sugar Ray Leonard, before he retired at the age of 28.
Sugar Ray said his knock out blow was 'was perhaps the most beautiful punch' he ever threw.
Mr Green, who was also known as the Fen Tiger, went on to become a businessman and in 2011 was made an MBE for his charitable services.
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