Aviello says his brother told him he killed Meredith Kercher in botched robbery . `` There 's no motivation I would guess for the police to actually pursue it , '' he said , when asked if the keys , clothing or knife Aviello claims were buried were ever dug up . ` Amanda Knox 's says he buried brother 's bloody knife , clothes and keys to Kercher 's apartment . Amanda Knox 's lawyers want Aviello 's story investigated for her appeal . Meredith , her former boyfriend were convicted of murdering Amanda Knox 's in age 17 .
Aviello says his brother told him he killed Meredith Kercher in botched robbery . Amanda Knox 's says he buried brother 's bloody knife , clothes and keys to Kercher 's apartment . Amanda Knox 's lawyers want Aviello 's story investigated for her appeal . Meredith , her former boyfriend were convicted of murdering Amanda Knox 's in age 17 .