That sucks. Its not your fault, things could have been the way they were supposed to be, but well, something fucked up.

you know, my brothers pal was driving his car with his girlfriend in the passenger seat, he lost control on an ice patch (or wtv), and got into the wrong way on a bridge. On his way, he crashed into a...uhh...you know those big ass metal lamps in the streets (LOL i suck) and well his gf died.
He was driving, yet it was not really his fault.

What do you tell the parents, huh?