"Knievel's death was confirmed by his granddaughter, Krysten Knievel. He had been in failing health for years, suffering from diabetes and pulmonary fibrosis, an incurable condition that scarred his lungs.See the whole story here. Thanks for Mark for the heads up.
Knievel had undergone a liver transplant in 1999 after nearly dying of hepatitis C, likely contracted through a blood transfusion after one of his bone-shattering spills."