PHOENIX (AP) — A cold case homicide has been solved after a man, apparently racked with guilt, drove across the country to confess killing an Arizona woman with a flashlight more than 15 years ago. Matthew Gibson has been sentenced to 10 years in prison after driving from North Carolina to Arizona to turn himself in to face charges that a prosecutor said wouldn't have come without the 55-year-old's surrender. Authorities said he told them he and the 38-year-old woman had argued, that he hit her with a flashlight and dumped her body after she died from the injury.