Matthew McConaughey enters as the titular hitman in Killer Joe literally coated in leather, clad in hide gloves, jacket and boots. It is one of the film's countless, indelible grindhouse moments, the man so defined by killing that even his wardrobe comprises death. On McConaughey, this dark outfit announces the arrival of a wolf in sheep's clothing (or cow's, as it were). The law never fares well in William Friedkin's films, where police detectives always morph into the very forces they hunt so obsessively. Killer Joe picks up where those other films end: Joe Cooper enters the film a monster, and the only thing close to a mitigating factor in his behavior is that the people who enlist his services may be even more repulsive.
Taking place in cramped trailers, run-down streets on the side of the railroad tracks that time forgot, and strip clubs lit in the electric zapper blues of Friedkin's last film, Bug, Killer Joe erects a world so white-trash that it could contain any redneck. Well, almost any redneck, for the film populates itself with such extreme Southern-fried types that they clash as violently with this setting as they would in Beverly Hills. Friedkin wastes no time establishing the lunacy of his dramatis personae, with debt-ridden drug dealer Chris (Emile Hirsch) beating on a trailer door in the dead of night as the film opens, only to be greeted by a close-up of Gina Gershon's bottomless, be-merkined unmentionables. Vulgarity and casual domestic violence ensues. But Gershon plays Chris' stepmom, Sharla, and she gets off light compared to how Chris views his biological mother. To him, the latter is just a hefty life insurance policy waiting to be collected and the answer his problems with his drug supplier. When he offers to cut the rest of the family in on the loot, no one raises any objection to the idea of having the woman killed, not even the seeming bundle of innocence, Chris' teen sister Dottie (Juno Temple).
