The Texan Season 1 Episode 9 The Widow Of Paradise

After Longley is forced to kill a barfly that tried to shoot him in the back, he learns a quirk in the Montana law code - any man who slays another in a fair fight is responsible for the care and feeding of the widow and children until she gets married. Longley's efforts to escape the snare all come to naught because the widow is in love with him and wants him for a husband until he resorts to reverse psychology.