Walter began her acting career on the stage. She won the Clarence Derwent Award in 1963 for Outstanding Debut Broadway Performance in Photo Finish by Peter Ustinov. She soon moved to television, and she played the character Julie Murano on the television series, Love of Life. While appearing on Love of Life from 1962 to 1965, she also acted on many other popular television series, including Naked City, East Side/West Side, Ben Casey, Route 66, The Doctors and the Nurses, The Rogues and The Defenders. Among those series is Walter's notable role as Lorna Richmond on "The Ordeal of Mrs. Snow" episode of The Alfred Hitchcock Hour which aired in April 14, 1964, and a supporting role as William Shatner's wife on the short-lived drama For the People (1965).