Amanda Knox parents hope appeal will lead to her release from Italian jail

Amanda Knox is appealing her murder conviction by an Italian court. The parents of Amanda Knox hope defense attorneys can poke holes in the prosecution's theory of motive.

Amanda Knox of the US, right, with her lawyer Carlo Della Vedova, arrives for a hearing for her appeals trial, in Perugia's courthouse, Italy, Nov. 24. Knox returned to court in Italy on Wednesday for the start of her appeals trial, about a year after the American student was convicted of killing her British roommate in a case that drew global attention.

Stefano Medici/AP Photo

November 24, 2010

The parents of Amanda Knox hope the appeal of her murder conviction in Italy results in her release by unraveling the prosecution's theory of the motivation.

Curt Knox and Edda Mellas told ABC news in Seattle there was no motive for their daughter to kill her British roommate in Perugia. The say the evidence at her trial didn't add up.

Related: Amanda Knox not guilty, says Italian mafioso

Prosecutors said the University of Washington student and her Italian boyfriend, Raffaele Sollecito, helped Rudy Hermann Guede kill Meredith Kercher in November 2007 during a sexual assault.

The 23-year-old Knox and Sollecito returned to court Wednesday for a hearing to open the appeal.

She has been sentenced to 26 years in prison, and he was sentenced to 25 years.