Tragedy in Valley Park brings home painful lessons to Missouri parents. Transient Johnny Johnson has been charged with kidnapping and killing 6-year-old Casey Williamson on Friday. St. Louis County Police Officer Mason Keller says parents must as involved in their children’s lives as they can, though there are no commoncharacteristics that can tip them off that their children are in danger. An intensive search of the area led to the discovery of the child’s body in an abandoned glass factory near her home.