CEDAR FALLS, Iowa (AP) — A third person has been charged with conspiracy in the slaying of a Waterloo man during a robbery attempt. Marquas Gafeney remained in custody Monday, charged with conspiracy to commit a forcible felony. Gafeney and two other men are accused in the Dec. 4 shooting death of Grant Saul. The two others are charged with the same crime. They are James Wright-Buls and Keyon Roby.