Wikipedia (the font of all wisdom, and probably another too source we need to be wary of) says heart attack. So, I misremember, confusing him with who? (Because I remember reading of someone who died of his car suddenly accelerating and crashing.)
Yeah there was another fellow who died in a single car accident on a straight dry stretch of highway during the day. Just accelerated and veered into an bridge column and rumors of air bags not deploying or deploying after impact.
And of course Philip Haney, DHS whistleblower, who caught the FBI poaching intelligence on Americans out of the military intelligence apparatus. Yeah, "suicide" by gun shot to the chest on he side of the road just outside San Fransisco with the gun found outside the car.