CSI finale - Gary Dourdan by Bill Inoshita/CBS CSI finale - Gary Dourdan by Bill Inoshita/CBS

Get ready for "the most shocking episode of CSI ever," according to exec producer Carol Mendelsohn. Given that past finales have featured Nick (George Eads) buried alive and a shocking revelation that Grissom (William Petersen) and Sara (Jorja Fox) had been sleeping together, they've got a lot to live up to.

But Mendelsohn promises they'll deliver. "It's a very personal episode," she says. Warrick ( Gary Dourdan) finds himself in more trouble following past episodes in which he was suspected of murder and suspended while investigating a Vegas mobster. The result is that sides will be drawn, and as TV Guide has reported, Dourdan - who was recently arrested - is leaving CSI.

The question remains how. Mendelsohn says, "No one will ever forget it, and it will change the show forever."