ET went behind-the-scenes of the hit crime fighting drama "CSI: Miami" as actress Lucy Lawless reveals her guest starring role.

Lawless rose to fame as the daring "Xena: Warrior Princess," but now she's playing a very different kind of character on "CSI: Miami" -- a woman of the night! Lawless plays a madame connected to a murder!

Watch the video to see scenes from Lawless' episode and interviews with series star, Emily Procter!

Catch "CSI:Miami" Mondays on CBS!