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What we know about NASCAR star Kyle Busch's severe illness

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NASCAR legend Kyle Busch, a two-time Cup Series champion, has died at 41 after a severe illness, leaving fans wondering what happened.

Editor's note: Read the latest updates on Kyle Busch's death . Kyle Busch, one the most accomplished and recognizable drivers in NASCAR history, has died . He was 41 and it came suddenly , leaving fans wondering what happened.

Busch was hospitalized earlier this week with a severe illness. That is all we know at the time of the announcement. His family had asked for privacy on Thursday morning.

He did not recover. The two-time Cup Series champion won 63 races in NASCAR’s premier series, a record. He won championships in 2015 and 2019 with Joe Gibbs Racing.

He dominated the sport for two decades, winning at every level and in nearly every condition the sport could present. We do know, however, he had been dealing with illness in recent weeks. At Watkins Glen on May 10, FOX Sports noted during its broadcast that he had been fighting a sinus cold.