Law & Order: Special Victims Unit (1999) : 11x13

Detectives Olivia Benson and Eliot Stabler find a woman bleeding from the neck and nearly dead. The woman dies before they reach the hospital, and soon the investigation leads them to the frontman of the death metal band Vampyre Sacrifyce. He bites girls, steals blood from the local blood bank and sings about violence to women all in the name of his strange, vampiric lifestyle. The singer claims he was nowhere near the scene of the crime, and soon a lesbian rights group led by Babs Duffy gets involved, claiming the victim's death was a result of police neglect. However, when more women from Babs's group are attacked, it becomes clear that the victim's case wasn't an isolated incident and that someone out there has a larger plan to bring the group down.