"Undertow" is the ninth episode of the American television drama series The Killing, which aired on May 22, 2011. The episode was written by Dan Nowak and was directed by Agnieszka Holland. In the episode, after their warrant for Bennet Ahmed gets quashed, the detectives question an acquaintance of his. Mayoral candidate Darren Richmond puts an end to any personal attacks on his opponent. The Larsens take justice into their own hands.