IT'S HEADS UP WHEN DETECTIVES GO UNDERGROUND TO FIND SLAYER OF HOMELESS MEN - When the body of several murdered homeless men are found sold to medical labs, Detectives Goren (Vincent D'Onofrio) and Eames (Kathryn Erbe) descend into abandoned subway tunnels - where they encounter its tormented inhabitants - until they discover all of the victims were newly registered for credit cards that were maxed out after their deaths. As they probe further, the investigators find a link to a suspicious auto parts salesman (as Butch, guest star Geoffrey Lewis) and his addled middle-aged girlfriend .