Kyle Busch death certificate reveals new details on driver's death

Two-time NASCAR Cup Series champion Kyle Busch was cremated in Mooresville, North Carolina, following his death last week, according to his death certificate first obtained by US Weekly.

The certificate revealed that Busch, 41, had been battling bacterial pneumonia for "days to weeks" before he died May 21 at 4:37 pm of natural causes. The pneumonia progressed into sepsis, which set in roughly one day before his death. The sepsis triggered disseminated intravascular coagulation, which is abnormal clotting throughout blood vessels that cuts off flow to organs. That was followed by hemorrhagic shock caused by severe bleeding. The DIC and hemorrhagic shock lasted for hours.

Busch's family announced Saturday that severe pneumonia had progressed into sepsis, "resulting in rapid and overwhelming associated complications."