Cecelia Hart

A teenager is found murdered, and Benson and Stabler discover that she was part of a group who met online to have sex. When they learn an older man was trying to lure her through the Web, their investigation of him takes an unexpected turn.

When the body of a public health physician -- whose job included contacting HIV patients' sexual partners -- is found in Central Park, the detectives end up with a long list of suspects. Michael Gross guest stars.

Encore: A dead jogger leads to a suspicious husband. The man, previously a prime suspect in his first wife's murder, is off the hook when a witness identifies someone else. Also available on Netflix

Profile: A racially integrated neighborhood is targeted by a serial killer, leaving Detectives Briscoe and Logan a short amount of time to stop the killings before another victim is claimed. Also available on Netflix