Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-24438878-20130807025507/@comment-11533671-20130807150712

As close as Scott is to him, I think he would have right away told Scott about werewolves since Scott was manifesting the traits of one. Further, he would've known about them from previous searches (learning about what killed his mother) instead of just now (or just "when" Scott began turning) coming across the information about werewolves. You add the fact that Beacon Hills has had a lot of "animal" attacks and I don't think Stiles would have been as ignorant about them, nor as quick to joke about them if his mother was attacked and killed by one and he saw it. This isn't to say she didn't get killed in this manner just not with him witnessing it. I can't recall if they ever did explain about her death. I don't think they have.