For the 1964 Indianapolis 500 Team Lotus had a new car, the type 34, but one of the 29s was entered for Bobby Marshman to drive. He qualified second behind Clark and led the race for 33 laps before running off the track and damaging an oil plug. Later that year his engine failed at the Tony Bettenhausen 200, and then he crashed while testing at Phoenix International Raceway and succumbed to burns incurred in the accident.