On 6 October 1935, Fontés was taking part in an illegal road race on public roads while drunk, when he was involved in a head-on collision with a motorcyclist, Reg Mordike. Mordike died the next day and as a result Fontés was charged with manslaughter, and after being convicted, was sentenced to three years in prison.[2][3] He was released from prison in February 1938 and soon resumed air racing, taking part in the 1938 King's Cup, finishing 13th, while also taking up powerboat racing.[4] Fontés later briefly served as an Air Transport Auxiliary ferry pilot during World War II but was killed on 12 October 1940 while delivering a Vickers Wellington Mk1C bomber to an RAF Aircraft Storage Unit at RAF Llandow in South Wales.[5] The Le Mans Lagonda M45R ('BPK 202') survives in the Dutch National Automobile Museum (Louwman Museum) at The Hague and the aeroplane was owned and raced for many years postwar by the late Ron Paine but is now owned by The Shuttleworth Collection, UK.