 Prosecutors in Tennessee say they're working on one of the most disturbing violent acts ever committed by an adult or juvenile. The suspect is 12, charged with first-degree murder after authorities say she suffocated her eight-year-old cousin in a bunk bed at their grandparents' house. Rihanna Smith was the victim's mother. My baby was eight. She didn't deserve that. You know what I'm saying? Like, she did nothing to deserve being killed. Family believes it followed an argument over an iPhone.