"Left Behind" is the 15th episode of the 3rd season of Lost. It was aired on April 4, 2007, making it the 64th episode of the series. The episode was written by Damon Lindelof and Elizabeth Sarnoff and directed by Karen Gaviola. The character of Kate is featured in the episode's flashbacks. Plot Flashbacks In a flashback to Iowa, Kate's car breaks down and is towed into a service station. She overhears a man and a woman arguing. The woman is Cassidy, whom Sawyer trained to be a grifter and all of whose money he stole in the flashbacks of a previous episode. She is working the jewelry con on the man. He thinks the necklaces are fake and wants to call the police, but Kate tells him that her father was a jeweler and that the jewelry is not fake, dissuading the man from calling. Cassidy asks Kate why she didn't want the police to be called; later, over drinks at a bar, Kate explains that her stepfather was a bad man, so she killed him, escaped from the US marshal who arrested her, and now is back in Iowa to talk to her mother. Cassidy offers to help. She says she was conned and embarrassed by a "bad guy" as well (referring to Sawyer) and that one of them deserves something good. Back in Iowa, Kate knocks on her mother's door. Diane opens the door, but before she can say anything, cops surround Kate and cuff her. Marshal Mars walks out only to realize that it is not Kate; it is Cassidy dressed as Kate, who claims to be just selling Bibles. Watching through binoculars from down the street is the real Kate, and she realizes just what she is up against - the police are paying very close watch to her mom so she will have a hard time securing contact with her. Later at the motel, Kate reveals that her mother gave her up to the police, despite Kate taking out an insurance policy on the home before buying it to set her mother up for life. Kate wants to know why her mom betrayed her and chose her abusive husband over her. Cassidy goes to the restaurant where Kate's mom works and 'accidentally' dumps a bowl of chili on her. Diane goes to the bathroom to clean up; Kate is waiting there for her. Diane