He wasn’t driving, so no, he bears no responsibility.
I don't think this is sufficient.
If my friend pulls out a gun and shoots me, totally out of character and without warning, I clearly bear no responsibilty at all for my own death.
If I've been playing drunken russian roulette with him for months in the local pub, mucking around and risking my, his and others' lives, and he pulls the trigger one day and it kills me, I clearly have a lot of responsibility for my own death.
I don't claim any knowledge about which of these two cases this death is closest to, but the idea that it couldn't have been either one is untenable.