 A disturbing story from Tennessee. A 12-year-old girl has been charged with first-degree murder after prosecutors say she suffocated her 8-year-old cousin in a bunk bed that they shared at their grandmother's house in Humboldt for the summer. Prosecutors called the act, quote, one of the most disturbing violent acts committed by either an adult or juvenile that the office has prosecuted, end quote. The victim's mother, Rayanna Smith, sharing with ABC News that she believes that the issue arose over an argument...