Marg Helgenberger returns for 300th episode of "CSI"
SP_COP - October 23, 2013 - www.cbsnews.com
Marg Helgenberger returns as Catherine Willows in tonight's (Oct. 23) landmark 300th episode of CBS' "CSI: Crime Scene Investigation."She will help solve a cold case that has haunted the team for 14 y...

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