‘The sport won’t be the same’: Nascar world reacts to sudden death of driver Kyle Busch

• 41-year-old died after hospitalization for severe illness

• Earnhardt, Hamlin and Gordon pay tribute

• Fans honor driver by donating to IVF foundation

Longtime teammates, former rivals and others around the sports world have joined the wave of condolences over the sudden death of Nascar driver Kyle Busch on Thursday.

Busch, a two-time Cup Series champion who was the winningest driver across the sport's three series in history, died at 41 after being hospitalized earlier Thursday with a severe illness. No cause of death has been announced.