Marg Helgenberger played an exotic dancer turned forensic scientist named Catherine Willows. But unlike most real-life crime scene investigators, the CSI agents were extremely multidisciplinary.

but Marg Helgenberger is doing just that. After 12 seasons the actress will leave the CSI in a two-part episode airing Wednesday, Jan. 18 and Jan. 25 at 10 p.m. EDT.

Jane Fonda cheers on as TV daughter June Diane Raphael, CSI's Marg Helgenberger arrested at D.C. protest CSI series finale react: Immortality William Petersen on CSI finale, Sara and Grissom ...

Marg Helgenberger has joined the cast of CSI: Vegas. Producers confirmed Friday that Helgenberger, 63, will reprise Catherine Willows in Season 2 of the crime drama series. Helgenberger originally ...