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ET’s Jann Carl is on the set of “CSI: Crime Scene Investigation” with the woman behind the dominatrix character Lady Heather and lead actor William Petersen!

Actress Melinda Clarke plays Lady Heather who has already appeared on the show on several occasions.

She talks about her scandalous character and gives a sneak peek into the suspenseful episode!

Click the pic below to view the video.

Watch Thursday to see the return of Lady Heather to “CSI” on CBS!