A man who led police to his grandmother’s home in St.Louis says he stabbed his grandmother’s male friend to death. But when police arrived, they also found the body of the grandmother. They think she might have died of a heart attack or other natural causes. In custody is Jamal Witt, charged with stabbing Rodney Staples with several knives and mutilating his body. An autopsy will be done on his grandmother today to determine why she died.