An American actress, perhaps best remembered as Lucy Ricardo's frenemy, the stuck-up Carolyn Appleby, in I Love Lucy.
The New York City-born Singleton trained as a classical ballerina, dancing for three seasons in the mid-1930s with the newly formed "Ballet Theatre", later to become the American Ballet Theatre.
She began her career in show business as a vocalist in the late 1930s with Art Jarrett's orchestra.
Her distinctive voice made her a favorite in the radio industry. During a guest appearance on the radio show My Favorite Husband in 1948 she met Lucille Ball and began their lifelong professional relationship.
She had continuing roles on I Love Lucy playing Carolyn Appleby in ten episodes. An early role was a guest appearance on The Adventures of Superman (1953).
In 1966, Singleton was teamed again with Ball on The Lucy Show in the episode, "Lucy and Art Linkletter", in which she played Miss Cosgrove, an actress whom Linkletter hires to help Lucy with a stunt on his TV show.
In an interview in The Lucy Book by Geoffrey Mark Fidelman (Renaissance Books, Singleton revealed that she had originally been hired to be a regular on Ball's third series, Here's Lucy, in 1968.
Ball would have played a dumb secretary and Singleton the more intelligent one, but the premise was dropped when Ball decided to cast her own children in the show. She did, however, appear in the series premiere episode, "Mod, Mod Lucy".
In 1970, Singleton was featured on an episode of the ABC-TV 1970-1971 sitcom, Make Room For Granddaddy (an updated version of The Danny Thomas Show) which had Lucille Ball as the guest star.
In this installment, titled "Lucy Carter, Houseguest", Singleton played Grace Munson, another character from I Love Lucy. Her final appearance on Here's Lucy was in 1974 as Lucille Ball's studio secretary in an episode titled "Lucy (Carter) Meets Lucille Ball". Singleton and Ball were reunited one last time, again as Ball's studio secretary, in the 1980 special Lucy Moves to NBC.
Though Singleton continues to be associated with her continued work with Lucille Ball, her interests lay in a much broader arena. Singleton guest starred on several other television shows including Hogan's Heroes, The Dick Van Dyke Show and The Twilight Zone, all on CBS, and on Rod Cameron's syndicated modern western crime drama, State Trooper.
She played Laura, the girlfriend of Butch Cassidy on a 1958 episode, "The Outlaw Legion," of the syndicated western Frontier Doctor. Singleton played the sympathetic neighbor, Susie, to Annie Fargé's scatterbrained character "Angel Smith" in the short-lived CBS sitcom Angel (1960–61).
Singleton also appeared in All in the Family as Edith's hotel roommate, Lydia Stonehurst in the 1971 episode "Edith has Jury Duty". She also appeared in two Perry Mason episodes, titled "The Crooked Candle" and "The Purple Woman".
Singleton guest-starred on My Three Sons, playing two different characters who had recurring roles throughout the long run of the show.
She originally played the mother of Meredith MacRae whose character Sally Morrison married original oldest son Mike Douglas (Tim Considine) in the 1964-65 season.
Later she played Margaret, mother of Polly Williams (Ronne Troup) in the 1970-71 season. At the time of her death in June 2012, Singleton was the last surviving major recurring adult cast members from the "Lucy" shows. Her last major acting role was in Deadly Messages (1985), though she appeared in advertising and voice overs for many subsequent years.
Doris Singleton died on June 26, 2012, aged 92, in her Los Angeles home. She had no children and left no immediate survivors
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