"What I Know" is the twenty-sixth episode of the American television drama series The Killing, and the thirteenth episode and season finale of its second season, which aired on the AMC channel in the United States on June 17, 2012. It is co-written by series developer Veena Sud and Dan Nowak, and is directed by Patty Jenkins. In the episode, the detectives close the Rosie Larsen case, arresting the person responsible; the Larsen family prepares to leave their former home, but not before learning a family member was involved in Rosie's death; and Darren Richmond (Billy Campbell) becomes Seattle mayor only to learn that campaign manager Jamie Wright (Eric Ladin) was involved in Rosie's death. The episode was originally the final episode to air due to show's cancellation, but the show was rev