Superior Donuts is done at CBS.

The series, which starred Jermaine Fowler, has been canceled after two seasons. Diane Guerrero joined the show as a series regular in its second season.

Fowler, currently the only black sitcom lead on the network (sans a couple from new ordered series), is also believed to be the first black sitcom lead on the network since Bill Cosby in Cosby, which went off the air in 2000.

The show followed the relationship between the gruff owner (Judd Hirsch) of a small donut shop, his enterprising new young employee (Fowler) and their loyal patrons in a quickly gentrifying Chicago neighborhood. Based on the play by Tracy Letts, the comedy also stars Katey Sagal, David Koechner, Maz Jobrani, Anna Baryshnikov, Darien Sills-Evans and Rell Battle. Bob Daily, Neil Goldman, Garrett Donovan, Mark Teitelbaum, John Montgomery, Michael Rotenberg, Josh Lieberman and Jermaine Fowler are the executive producers for CBS Television Studios.