Slain Missouri girl willingly went with suspect, police say 07/28/2002 From Wire Reports VALLEY PARK, Mo. - Cassandra Williamson, 6, barefoot and dressed only in her nightgown, was seen by witnesses riding piggyback on a man down the street to her death Friday morning, said St. Louis County Police Chief Ron Battelle on Saturday. "She went willingly," he said. St. Louis County has charged Johnny A. Johnson, 24, with first-degree murder, armed criminal action and attempted forcible rape in Friday's killing of the girl known as "Casey," who vanished from the home where Mr. Johnson also had spent the...