On television, Diaz appeared in the short-lived 1975-76 CBS television series, Popi, which starred Hector Elizondo. Popi which aired on CBS for eleven episodes, was one of the first television series on American network television to feature a Hispanic theme and cast. Her other television credits included guest roles on St. Elsewhere, All in the Family, Barney Miller and The Twilight Zone. In 1991, she played Desi Arnaz's mother, Dolores (Mother Arnaz), in the television movie, Lucy & Desi: Before the Laughter, on CBS.