NEW : The jury is expected to begin deliberations on Friday , after the prosecution completes its summary . Prosecutor accuses defense of `` lynching '' police who worked on case . Defense lawyer for Luciano Ghirga sobs becomes emotional during 22 years old 's closing argument . Amanda Knox as he tells the jury Della Vedova is innocent and has been mistreated . Knox , an American student , is accused of murdering her American roommate in Italy .
NEW : Prosecutor accuses defense of `` lynching '' police who worked on case . Defense lawyer for Luciano Ghirga sobs becomes emotional during 22 years old 's closing argument . Amanda Knox as he tells the jury Della Vedova is innocent and has been mistreated . Knox , an American student , is accused of murdering her American roommate in Italy .