Law & Order: Special Victims Unit (1999) : 5x8

Benson and Stabler have trouble identifying a male murder victim in his 20's found in a pile of sheets in the West Village; they later suspect an outspoken minister who was in the process of flooding the victim with hate mail and death threats. When the activist's alibi checks out, the detectives turn their attention to a professor who objects to the victim's thesis on the failure of sexual re-education groups.