Her role lasted a decade
Barbara Hale (April 18, 1922 – January 26, 2017).
Barbara Hale was an American actress best known for her role as legal secretary Della Street in the television series Perry Mason (1957–1966), earning her a 1959 Emmy Award for Outstanding Supporting Actress in a Drama Series. She reprised the role in 30 Perry Mason-made-for-television movies (1985–1995).
Hale appears with Donna Reed, Fred MacMurry, and Charlton Heston in the film The Far Horizons (1955).