In an extremely disturbing case in a Phoenix suburb, police say an 11-year-old carried out a murder-suicide with his grandfather's handgun after being asked to clean his room. The Maricopa County Sheriff's Office says the boy's grandfather told them he was sitting on the couch Saturday with grandmother Yvonne Woodard, 65, when the boy crept up behind them and shot Woodard in the head, the Arizona Republic reports. The grandfather said he ran after the boy, but returned to give his wife first aid. He then heard shots as his grandson turned the gun on himself. The grandfather said the boy had been asked to clean his room, but was being stubborn about it. The Litchfield Park couple had full custody of the boy and police say there had been no prior concerns about violence, News 12 reports. (More Arizona stories.)