Witness says Knox guilty of 'horrible murder' of Kercher

American Amanda Knox was confirmed as the killer of British student Meredith Kercher today by the very witness she hoped would clear her.

Rudy Guede, the first person to be convicted of Miss Kercher's killing in Perugia, Italy, had been called to give evidence in an appeal by Knox and her former boyfriend Raffaele Sollecito against their convictions.