His ability brought him an offer from Enzo Ferrari to drive for him, in Formula One just before 1955 Le Mans. However, just before joining the Italian marque, he was the first witness the horrendous tragedy at Le Mans, in which the Mercedes-Benz 300SLR of Pierre Levegh went into the crowd and killed 85 spectators. Walters said “"I had gotten used to drivers killing each other, but I could not adjust to drivers killing spectators"“, and at the age of just 38, he walked away from the sport.