This is the only thing that could hurt his fanatical core base, as through her death he would be responsible for that Elton John Candle in the Wind bullshit.
The truth is that NASA launched a missile that causes car crashes only and disappears on impact. It was funded by the jews through their donut campaign. This isn't a lie, look it up in google.
It's also a well known fact that Bush is an ancient shape shifter of draconian blood. This is also from a reputable source, google.
#11, there IS a missile that does that. It's called the Gigantifart and when lit off inside the vehicle, it can do exactly the damage (and leave no evidence) as you describe. Was Diana eating beans and bad eggs that night? The police should investigate.