Kyle Busch's cause of death was severe pneumonia that progressed into sepsis, his family says, after the two-time NASCAR Cup champion was hospitalized.

Health officials in Ohio are warning about an increase in pneumonia cases in children. The state has seen 145 cases in kids aged 3 to 14 years old, and some are referring to the condition as “white lung syndrome,” or “white lung” pneumonia.

NASCAR legend, Kyle Busch's sudden death at the age of 41 left the racing world in disbelief. Within a week of winning his last race and celebrating his son's birthday, the race car driver bid farewell to the world.