The Indy 500 festivities are overshadowed by the somber news of NASCAR legend Kyle Busch's passing at 41. Details from a 911 call reveal Busch became unresponsive in a racing simulator, suffering from shortness of breath, extreme heat, and coughing up blood just before his hospitalization. President Trump paid tribute, calling Busch a 'true talent' and a 'winner' who loved NASCAR.