Rosalie- Wedding Planner by day, Serial Killer by night

She clearly remembers that day. She was 18 years old when it happened. There was a scream. It sounded like it was her mother's. She immediately grabbed her knife. It had been a gift from her mother. She had told her "The world is full of danger. This knife will protect you". She slowly tiptoed her way to her father's study. He was in there with two other men. The door was slightly open and they were talking in hushed voices. She looked around and there she saw her. Her mother. Lying on the floor. Covered in blood. Dead. She didn't know what happened after that. All she knew was there were 3 other corpses in the room and a bloody knife in her hand.