Jessica Tuck will soon vamp it up on Castle.

The woman who makes us laugh as Nan Flanagan on True Blood will portray a wealthy museum benefactor on an episode of the ABC hit this fall. Look for her to be a suspect in a murder investigation, TV Line reports.

Tuck will come on board during the same episode that features Kristin Lehman as an art insurance investigator... and a possible love interest for Castle. But the latter is only booked for one installment, so viewers can rest easy about her future with the author/detective.