Dominique Deveraux (born Millie Cox) is a fictional character on the ABC prime time soap opera Dynasty and its spin-off, The Colbys. Portrayed by Diahann Carroll from 1984 to 1987, the character is the surprise half-sister of millionaire Blake Carrington (John Forsythe). Dominique was written out of the series at the end of its seventh season, and did not return for the 1991 miniseries Dynasty: The Reunion. In The CW's Dynasty reboot, Dominique is played by Michael Michele and is the mother of Jeff Colby (Sam Adegoke) and Monica Colby (Wakeema Hollis) as well as Blake's half-sister.