Kyle Busch had sepsis for only a day before a rapid formation of blood clots led to fatal hemorrhaging and blood loss, according to his death certificate.

The 41-year-old was hospitalized last week after he became unresponsive while test-driving in a race simulator near Charlotte, North Carolina.

It was later revealed that the married father of two had pneumonia, which led to sepsis, and he died last Thursday.

Sepsis, a life-threatening reaction to an infection, caused Busch’s blood to clot, which then impeded his organs, according to Us Weekly, which obtained his death certificate. As a result, Busch went into hemorrhagic shock.

The race car driver has been cremated in Mooresville, North Carolina, his death certificate showed.

The Mecklenburg County Medical Examiner’s Office did not immediately respond to the Daily Mail’s request for the document.

Kyle Busch had sepsis for only a day before blood clots led to hemorrhaging, blood loss and death on May 21, according to his death certificate
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Kyle Busch had sepsis for only a day before blood clots led to hemorrhaging, blood loss and death on May 21, according to his death certificate

NASCAR Hall of Famer and RCR team owner Richard Childress, Samantha Busch (Busch's wife), Brexton Busch (their son) and NASCAR Chief Executive Officer Steve O'Donnell stand on the grid during the remembrance ceremony for the driver, who died aged 41
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NASCAR Hall of Famer and RCR team owner Richard Childress, Samantha Busch (Busch’s wife), Brexton Busch (their son) and NASCAR Chief Executive Officer Steve O’Donnell stand on the grid during the remembrance ceremony for the driver, who died aged 41

The medical examiner’s findings support the claims made during a 911 call on May 20, when Busch was reportedly throwing up blood.

Initially, as the caller told the operator, Busch had ‘shortness of breath’ and felt ‘very hot.’

‘[He] thinks he’s going to pass out, and he’s producing a little bit of blood, coughing up some blood,’ they added.

The caller then confirmed Busch was still conscious, repeatedly telling dispatch: ‘He is awake. He’s awake. He’s awake.’

According to the 911 audio, the NASCAR great was lying on a bathroom floor at the facility while employees prepared for the paramedics’ arrival.

Busch was then rushed to the hospital, where he was pronounced dead the following day.

Previously, Busch dealt with a sinus issue during a NASCAR Cup Series race in Watkins Glen, New York, on May 10. Nearing the end of that competition, Busch radioed his pit crew to ask for the help of Bill Heisel, a certified physician’s assistant who had worked with the stock car circuit for years.

‘Can somebody try to find Bill Heisel?’ Busch asked the Richard Childress Racing crew. ‘He’s the [inaudible] doctor guy. Tell him I need him after the race, please… I’m gonna need a shot.’

Busch's parents, Tom and Gaye, and his brother, NASCAR Hall of Famer Kurt Busch, also attended the race as NASCAR honored the late driver with a moment of silence
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Busch’s parents, Tom and Gaye, and his brother, NASCAR Hall of Famer Kurt Busch, also attended the race as NASCAR honored the late driver with a moment of silence

Samantha broke down into tears as she embraced her 11-year-old son during Sunday's tribute
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Samantha broke down into tears as she embraced her 11-year-old son during Sunday’s tribute

Busch would go on to finish eighth and later told The Athletic on May 16 that he was still battling a cold prior to the May 23 All-Star race in Dover, Delaware.

It remains unclear what, if any, shot Busch received from Heisel. NASCAR spokesmen did not respond to the Daily Mail’s request for more information.

Heisel has not been accused of any wrongdoing. And although Busch referred to Heisel as a ‘doctor’ rather than a physician’s assistant, Heisel is not accused of misrepresenting himself or his work.

According to the TV broadcast, Busch had been struggling with a sinus cold that was exacerbated by the intense G-forces and elevation changes at the Upstate New York road course.

Brushing off the incident, Busch went on to claim his fifth NASCAR Craftsman Truck Series trophy days later on May 15.

Following his death, a heartbreaking clip of Busch’s post-race interview resurfaced.

After earning his 69th career Trucks Series race win with the triumph at Dover, he was asked how many races he wanted to win in his career before he stops racing.

‘You take whatever you can get, man,’ Busch said. ‘You never know when the last one is going to be, so cherish them all – trust me.’

Busch and his wife, Samantha, on the red carpet prior to the NASCAR Hall of Fame Induction Ceremony at Charlotte Convention Center on January 23
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Busch and his wife, Samantha, on the red carpet prior to the NASCAR Hall of Fame Induction Ceremony at Charlotte Convention Center on January 23

Kurt Busch laid white roses on a No 8, which had been stenciled onto the infield grass
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Kurt Busch laid white roses on a No 8, which had been stenciled onto the infield grass

Along with his wife, Samantha, Busch was a major proponent of in vitro fertilization, which helped the couple conceive children Brexton and Lennix.

In fact, his widow revealed in a November episode of her podcast that she saved embryos in case she ever wanted to have another child in the event of his death.

‘Here’s something I’ve never told anybody,’ Samantha told guest Ashley George. ‘I’m a certified over-sharer. So a lot of people ask me what we have done with our embryos because we still have some. I can’t part with them…I don’t know what else to do at this point because I love them so much and can’t make a decision.

‘Kyle was like, “We’re done having kids,” and I said, “But what if?” I told him the most morbid story the other day. I was like, “What if you passed? I would have to have another kid to be connected to you and name that child after you.”‘

SOURCE: https://www.dailymail.com/sport/othersports/article-15853253/Kyle-Busch-final-days-detailed-death-certificate.html