We often think of our heroes as untouchable. This is especially true for those who survive crashes at 200 miles per hour.

But sometimes the biggest fight happens away from the track. It happens in the quiet moments of a normal day.

WHAT HAPPENED

Kyle Busch was found in his Charlotte home on Thursday. He was using a racing simulator when he stopped moving.

Emergency crews rushed him to the hospital. Doctors say he had been dealing with a severe illness for a few days.

Just a short time ago, Busch told fans he felt something was wrong. This strange warning has left the racing world in shock.

What the evidence shows

• Age: 41 years old.
• Location: Found in a racing simulator in Charlotte, North Carolina.
• Career: Two-time NASCAR Cup Series champion.
• Family: Survived by his wife and two young children.
• Timeline: Health declined fast over just a few days.

THE BIGGER QUESTION

How does a world-class athlete get taken so quickly? We focus so much on the risks of the track that we forget how fragile life is.

Should we be looking closer at the long-term health of drivers? Or was this just a tragic event that no one could see coming?

THE OTHER SIDE

Medical experts have not yet released a cause of death. While some wonder about the physical toll of racing, there is no proof yet that his job caused this.

The family has asked for privacy while they wait for more answers. This is a fair request during such a hard time.

WHAT HAPPENS NOW

NASCAR will likely hold tributes at upcoming races. Fans are already leaving flowers and flags to honor the man they called "Rowdy."

His family now faces a future without a husband and father. The sport has lost one of its most famous and talented stars.

WHAT WE STILL DON'T KNOW

1. What was the specific illness that caused his sudden decline?
2. What exactly did Busch say in his warning about his health?
3. Will there be a public service for fans to say goodbye?