Lawyers representing a man serving 16 years in an Italian prison for the 2007 murder of Meredith Kercher are seeking a new trial.
Rudy Hermann Guede, from the Ivory Coast, was convicted of killing Miss Kercher in Perugia where she was sharing an apartment with US student Amanda Knox.
Guede has denied killing Miss Kercher and lawyers representing him filed a request for a new trial on Tuesday.
His conviction ruled he committed homicide "acting with others", but he is the only one to be definitively convicted of the murder.
Knox and her former boyfriend Raffaele Sollecito, who steadfastly proclaimed their innocence, were acquitted last year by Italy's highest criminal court.
It is unclear if a new trial could be granted since he has exhausted his appeals.