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"El Diablo" is the third episode of the American television drama series The Killing, which aired on April 10, 2011 on AMC in the United States. The episode was co-written by Dawn Prestwich and Nicole Yorkin and was directed by Gwyneth Horder-Payton. In the episode, councilman Richmond suspects a leak within his team. Sarah tracks down a witness, which leads to a suspect, while trying to work with her new awkward partner Holder.