Kyle Busch died after severe pneumonia progressed into sepsis, family says

• Two-time Nascar champion died Thursday at 41

• Busch had planned to race in Sunday's Coca-Cola 600

Nascar driver Kyle Busch died after severe pneumonia progressed into sepsis, resulting in rapid and overwhelming associated complications, according to a statement released by his family.

Dakota Hunter, vice-president of Kyle Busch Companies, said in a news release that the family received the medical evaluation on Saturday.