Busch, a two-time NASCAR champion, died at age 41 on Thursday, a day after passing out in a Chevrolet simulator.
WASHINGTON — 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 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.
This story is developing and will be updated.
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