Dr. Susan Langdon, worked as a FBI special agent and was assigned to the case of the 'welfare mom' serial killer who had killed up to 8 women. During the case, the killer taunted her. After a separate victim was discovered, she ended up falsifying evidence to get her main suspect prosecuted. Later, she wrote a successful book about how she captured him and then became a forensic pathologist.
- She is a former FBI agent.
- After resigning from the Bureau, she later became a forensic pathologist.