Italian prosecutors present closing arguments Friday in the final phase of American Amanda Knox's appeal of her murder conviction.

She has been in prison in Italy since 2007, when her British housemate Meredith Kercher was killed in the town of Perugia.

Knox and her Italian ex-boyfriend Raffaele Sollecito were convicted in 2009 of sexually assaulting and killing Kercher in what prosecutors say was part of a drug-fueled sex game that turned violent.

Knox was sentenced to 26 years in prison, Sollecito got 25 years. A third person, Rudy Guede was sentenced to 30 years.

All three say they are innocent.

Knox's appeal is based on the findings of independent court appointed experts who said the DNA evidence used to convict Knox was not reliable and was possibly contaminated by police.

Her lawyers will deliver closing arguments next week and a verdict could come any time after that.