In 2010, Cusack joined the Showtime drama/comedy Shameless as Sheila Jackson, the mother of Karen Jackson (Laura Slade Wiggins). The first season premiered on January 9, 2011, and had its first finale March 27, 2011. Cusack replaced actress Allison Janney, who originally portrayed the role in the first edit of the pilot episode, but was forced to drop out of the part owing to her series regular commitment on the ABC comedy Mr. Sunshine. Janney took the role with the understanding the character would be less prominent on the show, but when producers decided to increase the character's screen presence, she was forced to pull out of the part. Cusack has received critical acclaim for her performance, receiving Primetime Emmy Award for Outstanding Guest Actress in a Drama Series nominations in 2011, 2012, and 2013, as well as a nomination for the Primetime Emmy Award for Outstanding Guest Actress in a Comedy Series in 2014 and 2015, winning in the later year.
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