Serendipity

S5, E5: A newborn is found dead in a sewer. Benson (Mariska Hargitay) and Stabler (Christopher Meloni) go to a nearby apartment to question a very pregnant woman, but she's found dead. The woman, Brianna Morris, was going to give her baby up to Ron (Jack Gilpin) and Kelly (Barbara Garrick) Wolcott, who were excited about the adoption. But Ron found out Brianna had second thoughts about keeping the baby. Nonetheless, the Wolcott's are ruled out as suspects. A.D.A. Casey Novak (Diane Neal), new to the unit, is very aggressive, and she second-guesses the detectives.