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Kara DioGuardi

Justice SystemCrime, Law and JusticeKara DioGuardiRandy Jackson
Years on the show: 2. Kara DioGuardi joined the judges' panel in Season 8 of the Fox juggernaut. She departed from the show in 2010 when her contract wasn't renewed, leaving Randy Jackson as the only returning judge for the following season. Chris Pizzello / Associated Press
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