CONCORD, N.C. (AP) — NASCAR driver Kyle Busch experienced shortness of breath, felt he was overheating and was coughing up blood the day before his death, according to a 911 call obtained Friday by The Associated Press.

Busch died Thursday at age 41. No cause of death has been given, though his family said earlier he had been hospitalized with a “severe illness” three days before he was to compete in the Coca-Cola 600 at Charlotte Motor Speedway.

Busch was testing in the Chevrolet racing simulator in Concord on Wednesday when he became unresponsive and was transported to a hospital in Charlotte, several people familiar with the situation told the AP.