The episode, titled “Tone Death,” centers around a murder in the theater of Martha’s (Susan Sullivan) latest show. As Castle (Nathan Fillion) and Beckett (Stana Katic) investigate, they’re drawn into the unexpectedly dangerous world of competitive a capella.
Eddy is cast as Olivia “Mama” Toussaint. As “GH” fans know, Eddy has an incredible singing voice. She’s performed in the show’s annual Nurse’s Ball on a couple of occasions. Hopefully, she’ll get to belt out a tune — or two on Castle.
“Castle” airs Mondays at 10:00 PM, ET/PT on ABC.