Catherine Willows and District Engineer Paul Newsome investigate the collapse of an old apartment building that resulted in three deaths. Catherine faces internal tension as she suspects Newsome of negligence in his safety inspections. Key Forensic Evidence
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Investigators initially suspect two different weapons, but later confirm the assailant used the same dagger. The tip broke off during the stabbing of the second victim (Jessica), and the killer then returned to finish off the first victim (Kevin) with the broken blade. CSI Las Vegas 1x18