NASCAR driver Kyle Busch died from complications arising after just one day of sepsis, with his death certificate indicating that rapid blood clot formation led to fatal hemorrhaging and blood loss.

The $30 million man's final hours

Busch, a 41-year-old racing star, was hospitalized last week after becoming unresponsive during a test drive in a race simulator near Charlotte, North Carolina.

According to the death certificate, sepsis caused Busch's blood to clot, which then impeded his organs, resulting in hemorrhagic shock .

He was cremated in Mooresville, North Carolina.

911 call reveals symptoms of sepsis

A May 20 911 call reported that Busch was vomitig blood,with the caller initially reporting shortness of breath and feeling very hot.

Busch was described as possibly passing out and coughing up blood, though he remained conscious during the call.

He was lying on a bathroom floor at the facility while employees prepared for paramedics.

Pre-existing sinus issue may have contributed to sepsis

Earlier, on May 10 during a NASCAR Cup Series race in Watkins Glen, New York, Busch had experienced a sinus issue exacerbatted by G-forces and elevation changes.

He radioed his pit crew to request certified physician's assistant Bill Heisel for a shot after the race.

Busch finished eighth and later said he was battling a cold before the All-Star race on May 23 .

A family's grief and a warning about sepsis

Busch and his wife Samantha were proponents of IVF, having saved embryos; she discussed this on her podcast,sharing that Kyle wanted to stop having kids but she worried 'what if?'

This tragic event underscores the sudden and deadly nature of sepsis .