Marg Helgenberger returns to 'CSI' for 300th episode

Marg Helgenberger, who graced "CSI: Crime Scene Investigation" for 12 seasons before leaving in January 2012 will return on Oct. 23 to mark the series' 300th episode, Newsday's Verne Gay reports. Helgenberger's character, Catherine Willows, will come back to Las Vegas to help solve a cold case that has haunted the team for 14 years, the network said Tuesday. The 14th season of "CSI" starts on Sept. 25 at 10 p.m.