NEW : Prosecutor in defense of ` ` lynching '' police who worked on case . Defense lawyer for Luciano Knox becomes emotional during Wednesday 's closing argument . Luciano visibly shakes as he tells the jury Knox is innocent and has been acquitted . He told the jury they needed to be `` morally certain of their decision . '' Amanda , an American student , is accused of murdering her British roommate in London .
NEW : Prosecutor in defense of ` ` lynching '' police who worked on case . Defense lawyer for Luciano Knox becomes emotional during Wednesday 's closing argument . Luciano visibly shakes as he tells the jury Knox is innocent and has been acquitted . Amanda , an American student , is accused of murdering her British roommate in London .