Necrotising fasciitis is a potentially fatal clinical disease caused by infection with various bacteria. Diabetes mellitus, one of the predisposing factors for necrotising fasciitis is also an important factor in the progression of the illness by increasing its morbidity and mortality rate. In this case report, a 54 year old diabetic woman with type-I necrotising fasciitis of the heel was treated with extensive debridments, broad spectrum antimicrobial therapy and intensive regulation of blood glucose levels. The resulting new positive data pertaining to the morbidity and mortality of this severe disease suggest that the old management of this disease should be re-examined.