Ruth is a character with far too much on her plate: an overcrowded home, a troubled husband, a young son, an overbearing mother-in-law, a wearying job and an unwanted pregnancy, not to mention the shared burden of black people everywhere in a society skewed against them. Ms. Dee’s was a haunting portrait of a young woman whose desperation to maintain grace under pressure doesn’t keep her from being occasionally broken by it.

The play had 530 performances on Broadway and was reprised, with much of the cast intact, as a 1961 film. On screen, Edith Oliver wrote in The New Yorker, Ms. Dee was “even more impressive” than she was onstage. “Is there a better young actress in America, or one who can make everything she does seem so effortless?” Ms. Oliver wrote.

The loyal but worried loved one was a role Ms. Dee played frequently, in films like “The Jackie Robinson Story” (in which she played the wife of the pioneering black ballplayer, who starred as himself) and “No Way Out,” a tough racial drama in which she played the sister of a young doctor (Mr. Poitier).

Over the course of Ms. Dee’s career, the lives of American blacks, both extraordinary and ordinary, belatedly emerged as rich subject matter for mainstream theater productions and films, and black performers went from being consigned to marginal and often belittling roles to starring in Hollywood megahits.

Ms. Dee went from being a disciple of Paul Robeson to starring with Mr. Poitier on Broadway. She was a featured player in the films of Spike Lee and an Oscar nominee for a supporting role in the 2007 movie “American Gangster,” about a Harlem drug lord (Denzel Washington); she played a loving mother who turned a blind eye to her son’s criminality.