Actress Marg Helgenberger attends the opening night of "That Championship...

Actress Marg Helgenberger attends the opening night of "That Championship Season" at The Bernard B. Jacobs Theatre in Manhattan. (March 6, 2011) Credit: Getty Images

Marg Helgenberger, who graced "CSI" for so many seasons, will be back October for one night only - for the big 300th. CBS has announced and herewith the details: 

CSI: CRIME SCENE INVESTIGATION will celebrate its 300th milestone episode with original cast member Marg Helgenberger returning as Catherine Willows to help solve a cold case that has haunted the team for 14 years, Wednesday, Oct. 23 (10:00-11:00 PM, ET/PT) on the CBS Television Network. It’s back to the beginning for CSI’s 300th episode, when the team investigates a homicide in the home of a reclusive former casino mogul who was a suspect in a similar crime in 2000. The CSI team recalls who they were and where they were in order to solve the cold case.

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