René Le Bègue continued racing until the German occupation of France during World War II when he joined the Free French Forces. With the war over, in 1946 he prepared to return to the racing scene and was elected vice-president of the French Drivers Association (AGACI). However, early that year before the season started the thirty-two-year-old Le Bègue was accidentally asphyxiated by gas leaking from a defective water heater in his bathroom. The June 9, 1946 Grand Prix race at Saint-Cloud, won by Raymond Sommer, was named the René Le Bègue Cup in his memory.