T'Keyah Crystal Keymáh

T'Keyah Crystal Keymáh (born Crystal Walker; October 13, 1962) is an American actress and singer. 
Roles.
She is an original cast member of the Fox sketch comedy series "In Living Color" (1990–1994). Keymáh is also known for her roles as Erica Lucas on the CBS sitcom "Cosby" (1996–2000) Tanya Baxter on the Disney Channel sitcom "That's So Raven" (2003–2005). She is also the star and host on the Keymáh Network sketch variety show "The Cool Crystal Show" (2020–present).