Ballistics Expert in Murder Trial of Arizona Rancher Says Fatal Shot Likely Came From an AK-47

NOGALES, Ariz.—Lawyers for George Alan Kelly, the Arizona rancher accused of gunning down an illegal immigrant, pressed a ballistics expert on what the government “can’t prove” with available physical evidence. On cross-examination, forensic scientist Richard Wyant conceded the evidence does not directly connect Mr. Kelly to the firearm that caused the fatal shot. The state’s evidence also can’t identify the exact type of firearm used without a bullet to match the weapon, he said. The prosecution witness said the evidence also does not show the precise caliber of bullet that caused the fatal wound. Nor does it determine the exact flight path of the projectile....