Amanda Knox's defense lawyer urged Italy's highest court on Wednesday to overturn the American's conviction in the 2007 murder of her British roommate, calling it a "grave judicial error."

Knox faces 281/2 years in an Italian jail for the 2007 murder of 21-year-old Meredith Kercher in an apartment they shared in the university town of Perugia, after being convicted by a Florence appeals court last year along with her former boyfriend, Raffaele Sollecito.

Winding up Wednesday's arguments, Knox defense lawyer Carlo Dalla Vedova said the Florence court's conviction of Knox "is not justice, it is a distortion of the facts." She returned to the United States in 2011 after an earlier appellate court verdict acquitted the pair. - AP