She realizes in the end of the film that her father was one of her customers whom she had sexually pleasured, who had joined a pro-incest cult and sought to have sex with his visiting daughter.
Instead, he gazes out at the world.
As in the book series, Bill kills him in revenge for what he did to Sookie.
Flashbacks from long-repressed memories of the abuse eventually cause Charlie to suffer a nervous breakdown and wind up in a mental hospital.
In 1983, his take on the notorious Jeffrey MacDonald murder case led him being sued, with MacDonald alleging McGinniss made him believe he was on his side before slamming him in the book.
One neighbor, who's known the teacher for six years, was shocked to hear about the allegations.