Marie is a former classmate Edgar Jacobi.
Marie hated Edgar Jacobi like everyone else, though he did have a romantic interest in her. On Valentine's Day he gave her a card; in response she started hitting him and shouting how he disgusted her. As he was taught never to hit a girl, Eddie didn't react.
Eventually Eddie found acceptance thanks to the use of magic tricks that impressed his schoolmates. He asked for Marie to be his assistant, and she cooperated. Then, wanting to embarrass him, she pretended to see him differently. However she had a relationship with David, and one day when they were copulating in a glade, she told him her plans, which were overheard by Eddie who was walking nearby.
Enraged, Eddie used a trick to kill David, and laid his body on Marie's bed in her house. Marie woke up to find her lover gutted. She spent the following ten years in an asylum.