Katherine Moennig

Katherine Moennig, who memorably portrayed frisky hairdresser Shane on The L Word, will guest-star in the upcoming season of Dexter, TVGuide.com has learned exclusively.

Moennig will play a tattoo artist in the one-episode appearance. How she'll become embroiled in the serial killer's world remains unknown.

Peter Weller joins the cast of Dexter

The 32-year-old actress — and cousin of Gwyneth Paltrow — last starred in the short-lived CBS medical drama Three Rivers.

Johnny Lee Miller, April Lee Hernandez, Shawn Hatosy and Julia Stiles will also guest star in Dexter's fifth season. Peter Weller will co-star in eight episodes. Comic-Con audiences will get an exclusive sneak peak at the new season during the series' Thursday afternoon panel.

For its most recent season, Dexter received seven Emmy nominations — among them, for outstanding drama, lead actor Michael C. Hall and guest actor John Lithgow.

Johnny Lee Miller joins Dexter

The fifth season of Showtime's Dexter premieres Sunday, Sept. 26 at 9/8c.