Cason was an understudy for the character of Effie White in the original 1981 Broadway musical Dreamgirls, 1985 international tour, and 1987 Broadway revival. In 2006, she played May, the mother of Deena Jones, portrayed by Beyoncé Knowles in the feature film version of Dreamgirls. She also appeared in an episode of the sitcom The King of Queens as Mrs. Blanchard in the episode "Road Rayge". Her early musical training (while growing up in Washington, DC) was at The Sewell Music Conservatory.
Cason played Dahlia, the wicked stepmother, in the original 1996 run of Sisterella.[1][2] It was said that the character was played "with exquisite relish" by Cason.[2]