Results showed the accident was caused by an anchor bolt which fell off the front radius rod support, allowing the front axle to twist and misalign the front wheels when the brakes were applied, which drove the car into the wall. Bettenhausen died instantly. Complete AAA/USAC Championship Car results Indianapolis 500 results Complete Formula One World Championship results (key) (Races in italics indicate fastest lap) † Indicates shared drive with Joie Chitwood after retiring his own car. * Indicates shared drive with Chuck Stevenson and Gene Hartley. ‡ Indicates shared drive with Duane Carter, Marshall Teague and Jimmy Jackson after retiring his own car. џ Indicates shared drive with Paul Russo. Racing family Bettenhausen was the father of Gary Bettenhausen, Tony Bettenhausen Jr. and Merle Bettenhausen. Gary Bettenhausen and Tony Bettenhausen Jr. both raced in the Indianapolis 500 numerous times. Merle Bettenhausen is his sole surviving son as of 2021. Awards He was inducted in the National Midget Auto Racing Hall of Fame in 1985. He was inducted in the International Motorsports Hall of Fame in 1991. He was inducted in the Motorsports Hall of Fame of America in 1997. References External links The Greatest 33 1916 births 1961 deaths Champ Car champions Champ Car drivers Indianapolis 500 drivers International Motorsports Hall of Fame inductees People from Tinley Park, Illinois Racing drivers from Illinois Racing drivers who died while racing Sports deaths in Indiana AAA Championship Car drivers World Sportscar Championship drivers Bettenhausen family USAC Stock Car drivers Carrera Panamericana drivers