Busch, who was in his 22nd season in NASCAR's top division, had been hospitalized earlier with an undisclosed but "severe illness."

Kyle Busch, who won more races than anyone across NASCAR's three national series, has died at 41. A joint statement from the Busch Family, Richard Childress Racing and NASCAR said…

Busch, whose 234 national series race wins are the most in NASCAR history, died Thursday after falling ill. He was 41.

Busch won more races than anyone across NASCAR’s three national series.

Kyle Busch has died after he was hospitalized with an illness.