This story could not get any worse. Police now say that Charles and Braden Powell, the two young boys who were killed when their father intentionally set off an explosion in his house, were killed by "chops to the neck" and carbon-monoxide poisoning. The weapon used was either a hatchet or small ax. The boys reportedly had recently just begun to talk about the night their mother went missing, their grandparents’ attorney said on Monday. “The oldest boy talked about that they went camping and that Mommy was in the trunk. Mom and Dad got out of the car and Mom disappeared,” Steve Downing told the Associated Press. Susan Powell has been missing since 2009.