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Megan Mullally will guest star on the October 29 episode of NBC's Parks and Recreation, according to TV Guide.com.

Mullally will play the ex-wife of Amy Poehler's character's boss, Ron Swanson, played by Nick Offerman. In real life, Mullally and Offerman are husband and wife.

Mullally is currently appearing in Adam Bock's The Receptionist at the Odyssey Theatre in Los Angeles. On Broadway, she's been seen in Young Frankenstein and How to Succeed in Business Without Really Trying. She is best known for her work as Karen Walker on NBC's Will & Grace and recently starred in ABC's short-lived sitcom In the Motherhood.