Newton didn't deny putting a gun in her 7-year-old son's knapsack and stashing the bag at an abandoned house. But she and her lawyers argued the .25-caliber blue steel revolver she hid was not the one used to fatally shoot her son, Alton; her 21-month-old daughter, Farrah; and her husband, Adrian, 23, at their Houston apartment. Newton all along insisted she was innocent, and the claim about the gun was among several in her appeal to the Supreme Court. She also contended her trial attorneys were incompetent and evidence at her trial improperly was destroyed. "I know I did not...