AKRON, Ohio (AP) — A 15-year-old boy has pleaded guilty to aggravated murder in the sledgehammer slayings of an Ohio couple and could face life in prison without parole. Jamall Vaughn signed a guilty plea on Friday, court records show. Vaughn was 14 in April 2013 when Margaret Schobert, 59, and Jeffrey Schobert, 56, of New Franklin were bludgeoned to death.