The family of Kyle Busch has revealed details from the medical evaluation of the legendary racer. Severe pneumonia progressed into sepsis leading to his death.

Kyle Busch's family earlier Thursday announced he had been hospitalized with a "severe illness."

Kyle Busch, a two-time Cup Series champion who won more races than anyone across NASCAR’s three national series, has died. He was 41.

Busch, a two-time NASCAR champion, died at 41 on Thursday

Kyle Busch died after severe pneumonia progressed into sepsis, leading to rapid complications.