King starred as Nanny on the series So Notorious in 2006 and as Aunt Lou Marchbanks on the series Deadwood in 2006. One of her best known roles came starring as Grandma on the television series Mike & Molly from 2010 to 2016. She began starring as Eleanora Poe on the TV series A Series of Unfortunate Events in 2017. She has also starred in several films and episodes of TV series including The Cosby Show, Six Degrees of Separation, The Wayans Bros., Living Single, Hangin’ with Mr. Cooper,  Murphy Brown, Bubble Boy, and more.