S5, E17: The body of a 16-year-old girl is found brutally murdered in a car. When Emliy Sullivan is reported missing, the Detectives go to her well-appointed house in Westchester and confirm she's the victim. Emily told her parents she was sleeping over at Andrea Kent's (Arielle Kebbel) house, but instead she apparently snuck into the city and was killed. Benson (Mariska Hargitay) and Stabler (Christopher Meloni) go to Tanner Day School, an upscale private school, and talk to her grieving friends. They try the number she had given her parents and Brittany O'Malley's (Kelli Garner) cell phone rings, obviously in on the scam. They also discover Emily sent hundreds of threatening text messages to Agnes Linsky (Lindsay Hollister), an overweight, unpopular schoolmate.