Catherine Willows (Marg Helgenberger, left) uses her flashlight with Sara Sidle (Jorja Fox) as they look into the trunk of a car, on the milestone 300th
Catherine Willows (Marg Helgenberger, left) uses her flashlight with Sara Sidle (Jorja Fox) as they look into the trunk of a car, on the milestone 300th episode of CSI: CRIME SCENE INVESTIGATION, Wednesday, Oct. 23 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ÃÉÂÇÃÇ©2013 CBS Broadcasting, Inc. All Rights Reserved. ( Michael Yarish )