Marg Helgenberger returning to 'CSI'? Sort of.

Marg Helgenberger is coming back to 'CSI' – yes, the rumors are true – but just for one night. Helgenberger will reprise her character, Catherine Willows, for the show's 300th episode.

Robert Voets/CBS/File
Marg Helgenberger starred with William Petersen on 'CSI: Crime Scene Investigation' from 2000 to 2012. She will return for the 300th episode, airing in October.

Catherine Willows is back on the case. At least for one night.

Former "CSI" star Marg Helgenberger, who played Willows until her departure from the series last year, will return for the CBS drama's 300th episode, which will air Oct. 23, the network said Tuesday.

On the episode, Willows will help solve a cold case that has haunted the team for 14 years. The episode will hearken back to the show's beginnings, as 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 must revisit who they were and where they were in order to solve the cold case.

Helgenberger will also star in the network's upcoming drama "Intelligence," about a high-tech intelligence operative enhanced with a supercomputer microchip in his brain.

"CSI" returns for its 14th season Sept. 25.

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