Kyle Busch's family reveals NASCAR racer's cause of death

Kyle Busch, the trailblazing NASCAR driver, suddenly died two days ago after being earlier hospitalized for an unknown illness.

He was just 41.

His shocking death sparked speculations about what caused it.

Now, Busch's family has finally shared his cause of death.

In a statement, they said, "The medical evaluation provided to the Busch family concluded that severe pneumonia progressed into sepsis, resulting in rapid and overwhelming associated complications." 

"The family asks for continued understanding and privacy during this difficult time."

Busch was due to take part in the Coca-Cola 600 at Charlotte Motor Speedway.

Chilling fresh details from Kyle Busch's final hours

In shocking new details, it has emerged Busch suddenly collapsed while inside a Chevrolet racing simulator in Concord, North Carolina.

According to the Associated Press, he was swiftly shifted to a local hospital, but it was too late.

In addition, a chilling call recording obtained by ABC to 911 saw Busch had been unwell a day before his passing.

He can be heard experiencing a series of troubling symptoms.

From coughing up blood to shortness of breath and overheating.

Busch's tragic death shocked his many NASCAR's fans.