A graduate of New York's High School of the Performing Arts and the Neighborhood Playhouse School of the Theatre, Walter's extensive theater credits include productions both on and off Broadway. On Broadway, she has appeared in Peter Ustinov's "Photo Finish" (which earned her the Clarence Derwent Award as Most Promising Newcomer), "A Severed Head", "Advise and Consent", "Night Life" and Neil Simon's "Rumors". Her off-Broadway credits include roles at Playwrights Horizons and in Tartuffe, opposite Ron Leibman, at the Los Angeles Theater Center. Walter's feature films include Play Misty for Me (1971), which earned her a Golden Globe nomination, and the comedy Slums of Beverly Hills (1998). She has also appeared in Group, The (1966), Flamingo Kid, The (1984), Grand Prix (1966), Tapeheads (1988) and PCU (1994), among other films. 

Walter received an Emmy Award for Best Dramatic Actress in the television series "Amy Prentiss" (1974). She also earned Emmy nominations for her guest-starring roles in episodes of "Trapper John, M.D." (1979) and "Streets of San Francisco, The" (1972). Walter has starred in several series, miniseries and television movies.

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