You know Najimy from her breakout turn as Sister Mary Patrick in the nuns-who-sing comedy Sister Act and her co-starring run on the Kirstie Alley sitcom Veronica's Closet. More recently, she's guested on Numbers, Privileged, and Lifetime's Drop Dead Diva. She's also the voice of Peggy Hill on Mike Judge's animated show King of the Hill.
Executive producer Marc Cherry told EW's Michael Ausiello that Najimy's character and Teri Hatcher's Susan went to the same high school, where Susan stole her boyfriend.
Najimy's episode will air in October.