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CONCORD, N.C. (AP) — Kyle Busch died after severe pneumonia progressed into sepsis, resulting in rapid and overwhelming complications, according to a statement released by his family.
Dakota Hunter, vice president of Kyle Busch Companies, said in a news release the family received the medical evaluation on Saturday.
Busch, a two-time NASCAR champion, died at 41 on Thursday, a day after passing out in a Chevrolet simulator.
Typically the immune system releases chemicals to fight off pathogens like bacteria, viruses or fungi, but with sepsis the response goes into overdrive.
All 39 cars in the field for Sunday’s race will include a small black No. 8 decal to honor Busch.
Busch won 234 races across NASCAR’s top three series over his two-decade career, more than any driver in history. »