Radio

Castle's first work as an actress came in the soap opera Today's Children. Then, a spot on Lux Radio Theatre in 1947 brought her a screen test offer from 20th Century Fox.^[7]

Film

Castle was discovered by a talent scout while eating in a restaurant in Beverly Hills. She was signed to a seven-year contract with Universal-International and made her film debut in the 1947 film When a Girl's Beautiful. In 1949, she was named "Miss Cheesecake" by the Southern California Restaurant Association. Later that year, the Junior Chamber of Commerce named Castle "Miss Three Alarm".^[8][9] She later appeared in the films Mr. Belvedere Goes to College (1949),^[5] Payment on Demand (1951), The Prince Who Was a Thief (1951) Invasion, U.S.A. (1952), Cow Country (1953), 99 River Street (1953), Beginning of the End (1957), and Arrivederci Roma (1957). She often starred in Westerns, appearing in nearly a dozen between Wagons West (1952) and Hell's Crossroads (1957).

Television

In the 1950s, Castle moved into television. She appeared in multiple guest roles on Fireside Theater, Cheyenne, 77 Sunset Strip, and The Restless Gun. In 1957, she appeared as Amy Gordon on Cheyenne in the episode titled "The Spanish Grant". In 1957, she played defendant Sally Fenner in the Perry Mason episode, "The Case of the Negligent Nymph". Also in 1957, she was a primary star on Gunsmoke, playing a forlorn Nita Tucker in the episode "Chester's Murder".

From 1959 to 1962, she co-starred in the television Western series Lawman — her first continuing series.^[3] Her role as saloon owner Lily Merrill^[10] brought out a new dimension of Castle's talent. She stated, "For the first time in my life, I'm a singer — that's the producer's opinion, not mine."^[3]

Her final onscreen role was a guest appearance in a 1966 episode of The Virginian.

Stage

In 1958, Castle acted with Jesse White in a production of A Hole in the Head at the Civic Playhouse in Los Angeles.^[2]: 14

Personal appearances

In 1960, Castle and Peter Brown (who also was a regular in Lawman) traveled to rodeos, performing as a song-and-dance team. Castle stressed, "We're very careful not to sing any romantic songs," treating the act more like a brother-sister team.^[11] The duo's stops included St. Louis, Chicago, Detroit, Pittsburgh, and Albuquerque.^[11]

Death

Castle was addicted to alcohol.^[16] On August 11, 1973, her third husband, William McGarry, found her body on the couch of her Hollywood apartment. Her death was later determined to be caused by cirrhosis.^[17]

Films

Television