Kyle Busch suffered a tragic “chain of events” before his death at 41.

Busch had bacterial pneumonia for “days to weeks” before he developed sepsis, according to a death certificate obtained by Us Weekly.

The sepsis “disseminated intravascular coagulation, or small clots that form in the bloodstream,” which blocked blood flow to the organs, the report said.

Kyle Busch, driver of the #8 zone Jalapeno Lime Chevrolet, looks on during qualifying for the NASCAR Cup Series Daytona 500 at Daytona International Speedway on February 11, 2026 in Daytona Beach, Florida.Getty Images

Busch then dealt with hemorrhagic shock, which caused internal and external blood loss, and his death on May 21.

Rumblings of problems with Busch began the week earlier, when the driver appeared unwell on May 15, following his win in the NASCAR Craftsman Truck Series ECOSAVE 200 at Dover Motor Speedway.

He was hospitalized on May 20, with his family revealing in a statement that he was dealing with a severe illness and had to be pulled from all racing activities that weekend.

A day earlier, Busch was found unresponsive in a racing simulator. A 911 call, obtained by The Post, requested an ambulance for the racer, who was lying on the bathroom floor “coughing up blood” the day before his death at a General Motors Charlotte Technical Center in Concord, N.C.

NASCAR two-time Cup Series champion Kyle Busch died at the age of 41.Getty Images

Busch is survived by his wife, Samantha, and two children, son Brexton (11) and daughter Lennix (4).

The superstar racer was one of the best drivers of his era during the mid-2010s, a two-time Cup Series champion in 2015 and ’19, with 63 career Cup Series wins tied for ninth all time.

After missing the first 11 races in 2015 with a broken leg and foot, he still won the title that year.

Busch was the NASCAR Rookie of the Year in 2005, and the racing world honored and celebrated him at the Coca-Cola 600 at the Charlotte Motor Speedway Road Course and the Indianapolis 500 over the weekend.his life.