The man who used a rock and bricks to beat a six year old girl to death almost three years ago has been sentenced to die. A just has told Johnny Johnson he’s to be executed for the death of Cassandra Williamson in Valley Park. He later told police he killed the girl when she resisted his sexual advances, cleaned himself up in the nearby Meramec River, and went back to her house – where he’d been a guest – to get some cigarettes.