Born Margaret Ann Knudsen in Duluth, Minnesota, she made her Broadway debut in My Sister Eileen. She began her film career in 1946 in A Stolen Life opposite Bette Davis. That same year, she appeared in bit parts in several films including The Big Sleep and Humoresque with Joan Crawford.  Despite appearing in big budget features with established stars, Knudsen’s career never took off and she was relegated to smaller roles in B movies. Her last film role was in the 1957 film Istanbul with Errol Flynn.  She was married to Jim Jordan. Jr., the son of Jim and Marian Jordan, better known as Fibber McGee and Molly, with whom Peggy had three daughters.  In the 1950s and ’60s, Knudsen appeared in guest starring roles on several television shows. She made two guest appearances on Perry Mason in 1958-1959; one as Sheila Bowers in “The Case of the Gilded Lily,” and Marie Chapman in “The Case of the Spurious Sister.” Other television appearances included Alfred Hitchcock Presents, The Millionaire, and Pete and Gladys. After appearing in an episode of The Adventures of Ozzie & Harriet in 1965, Knudsen retired from acting.  Knudsen suffered from crippling arthritis for most of her later years and was cared for by her close friend, actress Jennifer Jones. On July 11, 1980, she died of cancer in Encino, California.  For her contribution to the television industry, Peggy Knudsen has a star on the Hollywood Walk of Fame at 6230 Hollywood Boulevard.  Her grandson is the Hollywood screenwriter John Orloff.