Luciano also says his brother told him he killed Meredith Kercher in botched robbery . Aviello says he found brother 's bloody knife , clothes and keys to Kercher 's apartment . Aviello told Knox 's lawyers during the videotaped interviews that his brother , who was staying with him at the time of Kercher 's murder , came home one night and said he had killed a girl during a botched robbery . " Knox 's lawyers want Aviello 's story investigated for her appeal . Knox , her former boyfriend were convicted of murdering Kercher in December 2009 .
Luciano also says his brother told him he killed Meredith Kercher in botched robbery . Aviello says he found brother 's bloody knife , clothes and keys to Kercher 's apartment . " Knox 's lawyers want Aviello 's story investigated for her appeal . Knox , her former boyfriend were convicted of murdering Kercher in December 2009 .