Supernatural- I dont get how their mother died, can anyone explain to me?

Well, the how is pretty simple. A demon did it. Pinned her to the ceiling, maybe cut her up (been a while since i've seen it) and burned the place down. Trapped her in the fire pretty much which is what should have killed her. The why part comes maybe in the 2nd season when they touch upon that subject again. The reason is pretty simple. She was in the way. Nothing really deep in it like I had thought. She had walked in on the 'yellow eyed demon' feeding his blood to Sam. *SPOILERS* in season three or something, it's reviled that she knew something was wrong because she herself was a hunter. It save the life of the Sam and Dean's father she made a deal with the yellow eyed demon that in a certian amount of years he would come back and take on of her children.

Supernatural is really a awesome show. This is the only show which i am following for a long time.and the source which i am following for a long time is http://supernatural-tvshow.blogspot.com/. That you can say is a trusted source and amazing source.

In the 4th season episode 3 the whole origin and the reason behind both why thy are who they are and how come Yellow eyes came into their lives is explained. The problem of giving out any more information is that it will spoil the episode for those who have not seen it. Also the way Yellow eyes kills is unique, with fire and that is how they have tried tracking him. In wiki they give a summary of his character which explains the whole thing again NOTE, it does contain spoilers for later episodes and contains spoilers for all seasons.

yep, that pretty much sums it up.. the Demon did it.... he also killed I believe it was Sam's girlfriend in the same way, and that is why a Sam left school and went to help Dean Demon hunt!