Law & Order: Criminal Intent S05E20 - To the Bone

A rampage of brutal machete slayings that target affluent art owners has Detectives Logan and Barek looking for some young suspects who were all raised by Chesley, a strong-willed foster mother. But the case really blows up when Logan unknowingly shoots an undercover cop dead -- and while Captain Deakins sticks his neck out for his detective, a shaken Logan must go eye-to-evil-eye with the manipulative Chesley.