Szmanda portrayed the CSI tech for the entirety of original CSI ‘s 15-season run on CBS. Helgenberger was added to CSI: Vegas ‘ Season 2 ensemble partly to fill the void left by fellow OGers Jorja Fox ...

When Marg Helgenberger left the first iteration of CSI back in Season 12, she did it because, well, she needed the break. She was the original female lead opposite Billy Petersen.