Italian prosecutors have called for a life sentence for American student Amanda Knox and her former boyfriend Raffaele Sollecito, accused of the murder of fellow student Meredith Kercher.A third man Randy Guede has already been convicted over the killing. In his final arguments Giuliano Mignini painted a picture in which a sex game and long-running hatred led to murder. Meredith Kercher’s throat was slit and she died an agonising death in a pool of her own blood in November 2007. The prosecution claim the pair then faked a burglary to cover their tracks. Both Knox and the Italian Sollecito deny the charge. They will present their final defence statements next month. Meredith Kercher from London was a university exchange student living in Perugia where she shared a flat with Knox. She was 21 at the time of her death.