Tony Sibson was Commonwealth and European champion and a three-time world title challenger.
He fought Marvin Hagler for the WBA and WBC middleweight titles in February 1983, losing by a technical knockout in the sixth round.
Sibson later moved up to Light heavyweight and lost to Dennis Andries in a bout for the WBC title in 1986.
Two years later he challenged Frank Tate for the IBF Middleweight title, this time losing by a 10th-round TKO.
Since retiring from boxing, Sibson has led a low-key life working within the building trade living in Leicester.