FALL RIVER, Mass. — Jurors heard grim testimony Friday in the murder trial of former New England Patriots standout Aaron Hernandez, who has been portrayed by his lawyers as a man with “the world at his feet” and no reason to kill. Two men who worked at a business near where semiprofessional football player Odin Lloyd’s body was found described a teenage jogger coming to their office early on the evening of June 17, 2013, to alert them to the body, then leading them down to an empty lot. One of the men, David Swithers, said he stopped about 20 feet away and saw a man on his back. “He was stiff and motionless.