"American Horror Story" creator Ryan Murphy told Deadline that Ebersole (Grey Gardens, 42nd Street) will have a recurring role as a "Glenda the Good Witch-type of gal."
As previously reported, "Coven" will also feature Jessica Lange, Lily Rabe, Sarah Paulson, Patti LuPone, Angela Bassett, Kathy Bates and Denis O'Hare as well as Evan Peters, Frances Conroy, Taissa Farmiga, Gabourey Sidibe, Emma Roberts, Alexandra Breckenridge and Jamie Brewer.
The story will center on a group of witches who fled Salem before the infamous trials, and have continued their secretive lives for centuries in New Orleans, where they encounter the voodoo culture. Lange will play the "supreme" role, with Paulson cast as her daughter.
Bassett will play the historical character of voodoo priestess Marie Laveau. Bates will portray another historical figure, serial killer Marie Delphine LaLauri (Madame LaLaurie). Part of the plot will pit Lange and her coven against the voodoo witches, as well as the non-witches.
"American Horror Story: Coven" will begin filming later this summer in New Orleans.