Fox says "American Idol" judge Paula Abdul has decided to quit the hit talent show.

In a posting on her Twitter account Tuesday evening, Abdul wrote that "with sadness in my heart," she's decided not to return to the show.

In a statement, Fox called Abdul an important part of "American Idol" over its eight seasons and said it was saddened by her decision to leave the show.

Fox announced Monday that new judge Kara DioGuardi would return for a second season with "American Idol."