Benz is known for her roles on TV's "Buffy the Vampire Slayer," "Angel" and "Dexter."
She is to appear on the March 14 installment of "Desperate Housewives." Supermodels Heidi Klum and Paulina Porizkova are also expected to play themselves in the episode, the network said.
Notable deaths of 2014 [PHOTOS]
Anna Gunn to play detective in 'Gracepoint'