Unchained (S05E04)

After the son of a police officer is mistakenly murdered, investigating Detectives Logan (Chris Noth) and Barek (Annabella Sciorra) step into the middle of a brutal mob war that also has ensnared dirty cops who sold out to help the rival crime families. But when Captain Deakins (Jamey Sheridan) informs Logan that he wants both the tainted officers and a mob underboss, Logan takes aim at one decorated ex-officer (guest star David Keith) – and finds himself the public target of the man's lawyer who claims the detective has a little "history" of his own. (iTunes)