Key prosecution witness gives contradictory testimony over murder of British student Meredith Kercher Lawyers appealing against the convictions of Amanda Knox and Raffaele Sollecito for murdering British student Meredith Kercher have claimed an important victory in court, as a key witness for the prosecution gave confusing and contradictory testimony. Antonio Curatolo, a homeless drug addict living in Perugia, close to where Kercher was murdered, on 1