NASCAR legend Kyle Busch has died at the age of 41 following rapid complications from severe pneumonia that progressed into sepsis.The champion driver collapsed during simulator training in North Carolina after previously seeking medical aid for a lingering sinus infection.Tributes are being planned across the racing world, including special honors at the upcoming Coca-Cola 600 and the Indianapolis 500.Family members confirmed his passing after a brief but severe decline that followed his recent participation in multiple racing events.