Law & Order: Special Victims Unit - Season 4 Episode 4

A public health doctor, the wife of a retired attorney, who tracked HIV cases is found murdered and raped in Central Park. Her work involved contacting sexual partners of HIV patients which gives the detectives a long list of suspects and the detectives try to link threatening phone calls to the crime. The discovery of a second body in Central Park with the same signature shifts the focus to a possible serial killer.