Law & Order: Criminal Intent (2001) : 5x12

Logan and Barek investigate after a body is found in the ocean, having fallen from an airline wheelwell. They soon discover that she is just one in a long line of prostitutes to be beaten and murdered. Their investigation leads them to a nervous airline employee, but they just don't feel he has the courage or the violent nature to commit these crimes on his own. A family connection leads them to a second suspect, with a history of both being abused and being the abuser.