Marg Helgenberger: More 'CSI' clips

Someone wants Catherine Willows -- Marg Helgenberger -- dead? Well, apparently.

Check out this explosive clip. As you know, the two-part farewell to Helgenberger begins Wednesday night.

Here's a quick program description: "When Willows works with the FBI again after a professional hit occurs at a law firm she recommended to her friend, the CSI team identifies shocking similarities at the crime scene.