The Klopeks didn't kill Walter... they killed the former owners of the house they're living in: The Napps; that explains all those bones in the trunk of the Klopeks' car. Werner Klopek tries to kill Ray (as he's being driven away in an ambulance) but is unsuccessful. The Klopeks are arrested. Art's wife returns. Ray goes home with his wife and it's time to relax and enjoy his vacation.