Marg Helgenberger said Wednesday the 12th season of the Las Vegas-set crime procedural "CSI" will be her last.

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E! News said the actress announced her departure during CBS' Television Critics' Association panel in Los Angeles.

"I've been itching to get back on the stage, but it's been hard," the actress said.

"The commitment on this show and then raising a son, who's now 20, a production assistant on 'CSI!' He was 9 when I started the show. That's one of the cute things about being on this show as long as you've been on. A lot of crew members' children who were all little kids at the time are now working on staff. That's what makes it even more of a family and even harder to leave."