 Northeast of Memphis in Gibson County, Tennessee, a 12-year-old girl is charged with first-degree murder, accused of suffocating her 8-year-old cousin in a bunk bed they shared at their grandmother's house where they were spending the summer. Rihanna Smith is the mother of the dead girl. My baby was 8. She didn't deserve that. You know what I'm saying? She did nothing to deserve being killed. She believes her daughter was murdered in an argument over a cell phone.