THORNTON, Colo. -- A man killed his wife and then himself at a Kingdom Hall of Jehovah's Witnesses in suburban Denver, Thornton police said Sunday.A fire was reported at the hall around 9 a.m. before another caller told police that a man had shot a woman and then himself, authorities said.The man and woman were former members of the congregation, police said.Luis Sanchez lives across the street and heard two gunshots Sunday morning.A hazmat team with the Adams County Sheriff's Office is investigating suspicious devices at the hall."