Andrew Freedman said Kitt, who was recently treated at Columbia Presbyterian Hospital, died Thursday in Connecticut of colon cancer.
Kitt, a self-proclaimed "sex kitten" famous for her catlike purr, was one of America's most versatile performers, winning two Emmys and nabbing a third nomination. She also was nominated for several Tonys and two Grammys.
Her career spanned six decades, from her start as a dancer with the famed Katherine Dunham troupe to cabarets and acting and singing on stage, in movies and on television. She persevered through an unhappy childhood as a mixed-race daughter of the South and made headlines in the 1960s for denouncing the Vietnam War during a visit to the White House.
Through the years, Kitt remained a picture of vitality and attracted fans less than half her age even as she neared 80.
When her book Rejuvenate, a guide to staying physically fit, was published in 2001, Kitt was featured on the cover in a long, curve-hugging black dress with a figure that some 20-year-old women would envy. Kitt also wrote three autobiographies.
Once dubbed the "most exciting woman in the world" by Orson Welles, she spent much of her life single, though brief romances with the rich and famous peppered her younger years.
After becoming a hit singing Monotonous in the Broadway revue New Faces of 1952, Kitt appeared in Mrs. Patterson in 1954-55. (Some references say she earned a Tony nomination for Mrs. Patterson, but only winners were publicly announced at that time.) She also made appearances in Shinbone Alley and The Owl and the Pussycat.
Her first album, RCA Victor Presents Eartha Kitt, came out in 1954, featuring such songs as I Want to Be Evil, C'est Si Bon and the saucy gold digger's theme song Santa Baby, which is revived on radio each Christmas.
The next year, the record company released follow-up album That Bad Eartha, which featured Let's Do It, Smoke Gets in Your Eyes and My Heart Belongs to Daddy.
In 1996, she was nominated for a Grammy in the category of traditional pop vocal performance for her album Back in Business. She also had been nominated in the children's recording category for the 1969 record Folk Tales of the Tribes of Africa.
Kitt also acted in movies, playing the lead female role opposite Nat King Cole in St. Louis Blues in 1958 and more recently appearing in Boomerang and Harriet the Spy in the 1990s.
On television, she was the sexy Catwoman on the popular Batman series in 1967-68, replacing Julie Newmar who originated the role. A guest appearance on an episode of I Spy brought Kitt an Emmy nomination in 1966.
"Generally the whole entertainment business now is bland," she said in a 1996 Associated Press interview. "It depends so much on gadgetry and flash now. You don't have to have talent to be in the business today.
"I think we had to have something to offer, if you wanted to be recognized as worth paying for."
Kitt was plainspoken about causes she believed in. Her anti-war comments at the White House came as she attended a White House luncheon hosted by Lady Bird Johnson.
"You send the best of this country off to be shot and maimed," she told the group of about 50 women. "They rebel in the street. They don't want to go to school because they're going to be snatched off from their mothers to be shot in Vietnam."
For four years afterward, Kitt performed almost exclusively overseas. She was investigated by the FBI and CIA, which allegedly found her to be foul-mouthed and promiscuous.
"The thing that hurts, that became anger, was when I realized that if you tell the truth - in a country that says you're entitled to tell the truth - you get your face slapped and you get put out of work," Kitt told Essence magazine two decades later.
In 1978, Kitt returned to Broadway in the musical Timbuktu!- which brought her a Tony nomination - and was invited back to the White House by President Jimmy Carter.
In 2000, Kitt earned another Tony nod for The Wild Party. She played the fairy godmother in Rodgers and Hammerstein's Cinderella in 2002.
As recently as October 2003, she was on Broadway after replacing Chita Rivera in a revival of Nine.
She also gained new fans as the voice of Yzma in the 2000 Disney animated feature The Emperor's New Groove.
In an online discussion at Washingtonpost.com in March 2005, shortly after Jamie Foxx and Morgan Freeman won Oscars, she expressed satisfaction that black performers "have more of a chance now than we did then to play larger parts."
But she also said: "I don't carry myself as a black person but as a woman that belongs to everybody. After all, it's the general public that made (me) - not any one particular group. So I don't think of myself as belonging to any particular group and never have."
Kitt was born in North, S.C., and her road to fame was the stuff of storybooks. In her autobiography, she wrote that her mother was black and Cherokee while her father was white, and she was left to live with relatives after her mother's new husband objected to taking in a mixed-race girl.
An aunt eventually brought her to live in New York, where she attended the High School of Performing Arts, later dropping out to take various odd jobs.
By chance, she dropped by an audition for the dance group run by Dunham, a pioneering African-American dancer. In 1946, Kitt was one of the Sans-Souci Singers in Dunham's Broadway production Bal Negre.
Kitt's travels with the Dunham troupe landed her a gig in a Paris nightclub in the early 1950s. Kitt was spotted by Welles, who cast her in his Paris stage production of Faust.
That led to a role in New Faces of 1952, which featured such other stars-to-be as Carol Lawrence, Paul Lynde and, as a writer, Mel Brooks.
While traveling the world as a dancer and singer in the 1950s, Kitt learned to perform in nearly a dozen languages and, over time, added songs in French, Spanish and even Turkish to her repertoire.
Usku Dara, a song Kitt said was taught to her by the wife of a Turkish admiral, was one of her first hits, though Kitt says her record company feared it too remote for American audiences to appreciate.
Song titles such as I Want to be Evil and Just an Old Fashioned Girl seem to reflect the paradoxes in Kitt's private life.
Over the years, Kitt had liaisons with wealthy men, including Revlon founder Charles Revson, who showered her with lavish gifts.
In 1960, she married Bill McDonald but divorced him after the birth of their daughter, Kitt.
While on stage, she was daringly sexy and always flirtatious. Offstage, however, Kitt described herself as shy and almost reclusive, remnants of feeling unwanted and unloved as a child. She referred to herself as "that little urchin cotton-picker from the South, Eartha Mae."
For years, Kitt was unsure of her birthplace or birth date. In 1997, a group of students at historically black Benedict College in Columbia, S.C., located her birth certificate, which verified her birth date as Jan. 17, 1927. Kitt had previously celebrated on Jan. 26.
The research into her background also showed Kitt was the daughter of a white man, a poor cotton farmer.
"I'm an orphan. But the public has adopted me and that has been my only family," she told the Post online. "The biggest family in the world is my fans."
