Van der Sloot said the teen was unconscious, or possibly already dead, when he picked up a nearby cinderblock and brought it down on her.
Joran van der Sloot confession about Natalee Holloway's murder was 'chilling' attorney says
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At one point, he said Holloway was buried in gravel under the foundation of a house but later admitted that was untrue.
Joran van der Sloot, Natalee Holloway's confessed killer, returns to Peru to serve out sentence
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