Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-65.93.156.96-20130808005739/@comment-11533671-20130809030240

LadyX wrote: ^^ agreed. That's why I think that the guilt he obviously felt in that earlier episode was because she was, maybe, in a car accident either going to pick him up somewhere, or he was distracting her while she was driving.

This is exactly what I've always thought. I believe Stiles was in some sort of junior sports, lacrosse or not. It was some sort of extracurricular event at any rate and she wrecked/was murdered to or from there. Maybe she went to get him from a place and he had wandered off to investigate something, lost track of time,etc., "pulling a Stiles". She wrecks or is murdered and thus his Dad's angst about the whole thing. Part of him blames Stiles but his rational side knows it was an accident. Stiles' dad is often chastising him for wandering everywhere as seen in Season 1 when he caught him in the woods and asks him where Scott is. Stiles denies Scott being with him that night; which in turn leaves Scott alone in order to be bit. Oh, well can't wait to see the backstory.