The appeals case of Amanda Knox, the American student convicted of killing her British roommate, resumed Monday with lawyers questioning independent experts who cast doubt on the evidence used in the first trial.

 The 24-year-old from Seattle who has been behind bars since the November 2007 murder was in the Perugia courtroom, as was her co-defendant and onetime boyfriend, Raffaele Sollecito.

Amanda Knox Optimistic and Anxious Attends Hearing --->

Ahead of the hearing, the first after the summer break, the sister of victim Meredith Kercher issued a letter asking the appeals court to assess "every single (piece) of evidence" so that justice can be done. Read more: