Margaret White

Margaret White is arguably the chief villain of Stephen King's novel "Carrie" - even though it is her daughter, Carrie White, who serves as the titular villain, Margaret White is a horribly abusive religious zealot who punishes her daughter continually for any and all "sins", viewing her as a demon child and showing no remorse over severe emotional and physical abuse (she was also heavily implied to be insane herself, as she believed herself to be continually under assault from evil forces).

In the film's climax Margaret is killed by Carrie, ending her reign of terror, sadly before this occurs the abusive Margaret is able to stab her daughter - this would later prove to be fatal and Carrie died a short time later in the arms of one of her few friends.