'CSI' Season 14: Marg Helgenberger returning for 300th episode

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marg-helgenberger-pilot.jpgThe 300th episode of "CSI" will bring a very familiar face back to the Las Vegas crime lab.

Marg Helgenberger, who left the long-running CBS drama a couple years ago, will make a return appearance as Catherine Willows in the milestone episode, which is scheduled to air Oct. 23.

Catherine's will return will be sparked by the reopening of a cold case from 14 years back. A former casino mogul becomes a suspect when someone is killed in his home, with the details similar to a case the team worked back in 2000.

The episode will include, per TVLine, what executive producer Don McGill is calling "faux-backs" -- newly filmed flashback scenes that feature Catherine, Nick ( George Eads) and other current cast members who were also around at the show's start.

Helgenberger left "CSI" in January 2012 as Catherine took a job with the FBI. She stars in CBS' midseason series "Intelligence," which is scheduled to premiere in February.

Photo/Video credit: Getty Images