Kyle Busch was hard at work preparing for the Coca-Cola 600 before his shocking death Thursday.

According to multiple reports, the star NASCAR driver was found unresponsive while testing inside the Chevrolet racing simulator at the GM Charlotte Technical Center in Concord, N.C.

While it’s unclear what cause Busch’s untimely death at the age of 41, a 911 call revealed he was coughing up blood on the bathroom floor before being taken to the hospital with what his family called a “severe illness.”

Despite battling what was believed to be a sinus issue exacerbated by G-forces and elevation changes at Watkins Glen just 11 days earlier, Busch forged ahead with his preparation for Saturday’s race at Charlotte Motor Speedway.

The GM Charlotte Technical Center features three “Driver-in-the-Loop” simulators, which allow drivers to get as close as they can “to racing without actually strapping in,” per Chevrolet.

“Tracks are scanned to a very high resolution and feature all visual elements around the track, along with each bump or unique part of the surface,” a 2024 feature on the Center explained.

“What’s more, each rig offers the motion and G-forces a driver would experience at speed.”

Drivers can also use the tool to test new setups — or try those of rival manufacturer via a “ghost car.”

The near-instantaneous feedback allows drivers to see how various components of the car react during training sessions, offering the same feedback as a test run at the track.

The facility also features a media event space, conference rooms, a full gym as well as spaces for testing, tweaking and updating vehicles.

That Busch was still putting himself through the rigors in the midst of his 24th NASCAR season is not surprising.

A surefire Hall of Famer, he competed in 12 races on the 2026 season, twice finishing in the top 10 and ranking 24th with 217 points.

In the hours since the announcement of his death, the racing world has stopped to mourn his passing and celebrate his life.

“On behalf of the Busch family, everyone at Richard Childress Racing and all of NASCAR, we are devastated to announce the sudden and tragic passing of Kyle Busch,” NASCAR wrote in a statement Thursday. “Our entire NASCAR family is heartbroken by the loss of Kyle Busch. A future Hall of Famer, Kyle was a rare talent, one who comes along once in a generation. He was fierce, he was passionate, he was immensely skilled and he cared deeply about the sport and fans.”