Tortured

S4, E16: A young Asian woman is found murdered, with her foot sawed off. The victim is of Tibetan origin and by tracking through INS they reveal her identity, Kunsong Tashi, who is married to Preston Bennett (Fredrick Weller). Kunsong has been tortured repeatedly, and Preston admits that he was doing everything he could to help his wife recover from her horrible past. She was always at the Center - a program for torture survivors at Bellevue, and they go there to talk to her physician and psychiatrist. In the meantime, Benson (Mariska Hargitay) and Stabler (Christopher Meloni) are starting to question Preston's innocence, because Kunsong was out with another man right before she died, who used Preston's credit card.