Law & Order: Criminal Intent (2001)

Season 4: Episode 19

When Lisa Ross is brought into the emergency room with a severe case of cloracne, suspicion quickly turns to her husband Greg, a well-known dentist, especially after she dies. During their investigation, Goren and Eames hear whispers about Lisa's infidelities, but the real break comes with they learn that Lisa is not the first woman Greg Ross has been connected to who died of the same symptoms years earlier. After discovering Lisa's connection to Greg's former fiancée Morgan Dexler, Goren and Eames believe they have the answer, but they're not there yet.