Jackie Kennedy's sister on JFK assassination: 'Finally, I'm free'

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Jackie Kennedy's Sister on JFK Assassination: 'Finally, I'm Free'

Lee Radziwill, the younger sister of former first lady Jackie Kennedy, is shedding more light on the sisters' often contentious relationship.

Radziwill told Vanity Fair that she and her sister frequently argued after John F. Kennedy was assassinated. She even said her sister slapped her in the face once.

The socialite admitted she had mixed emotions following his death, saying, "There were so many things I couldn't do when my brother-in-law was president. Finally, I'm free."

PHOTOS: Lee Radziwell and Jackie through the years

39 PHOTOS
Lee and Jackie Kennedy
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Jackie Kennedy's sister on JFK assassination: 'Finally, I'm free'
PARIS, FRANCE - OCTOBER 07: Lee Radziwill attends the Moncler Gamme Rouge show as part of the Paris Fashion Week Womenswear Spring/Summer 2016 on October 7, 2015 in Paris, France. (Photo by Pascal Le Segretain/Getty Images for Moncler)
PARIS, FRANCE - JULY 03: Lee Radziwill attends the delivery of the medal of the 'Chevalier de l'Ordre des Arts et des Lettres' to Gilles Dufour at Maxim's on July 3, 2013 in Paris, France. (Photo by Francois Durand/WireImage)
Princess Lee Radziwill arrives to attend the Christian Dior Haute Couture Spring-Summer 2013 collection show by Belgian designer Raf Simons on January 21, 2013 in Paris. AFP PHOTO / GUILLAUME BAPTISTE (Photo credit should read GUILLAUME BAPTISTE/AFP/Getty Images)
PARIS, FRANCE - JULY 03: Lee Radziwill attends the delivery of the medal of the 'Chevalier de l'Ordre des Arts et des Lettres' to Gilles Dufour at Maxim's on July 3, 2013 in Paris, France. (Photo by Francois Durand/WireImage)
PARIS, FRANCE - JULY 06: Lee Radziwill is sighted on the 'Avenue Montaigne' on July 6, 2012 in Paris, France. (Photo by Marc Piasecki/FilmMagic)
PARIS, FRANCE - JULY 02: Lee Radziwill attends the Giambattista Valli Haute-Couture Show as part of Paris Fashion Week Fall / Winter 2013 at Hotel Crillon on July 2, 2012 in Paris, France. (Photo by Marc Piasecki/WireImage)
PARIS, FRANCE - JUNE 28: (L-R) Lee Radziwill and Sharon Stone poses during the amfAR Inspiration Night Paris at Maxim's on June 28, 2012 in Paris, France. (Photo by Marc Ausset-Lacroix/WireImage,)
PARIS, FRANCE - MARCH 05: Lee Radziwill attends the Giambattista Valli Ready-To-Wear Fall/Winter 2012 show as part of Paris Fashion Week on March 5, 2012 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
NEW YORK, NY - OCTOBER 27: Designer Giambattista Valli and Lee Radziwill attends the Fashion Group International's 28th annual Night of Stars at Cipriani Wall Street on October 27, 2011 in New York City. (Photo by Michael Loccisano/Getty Images)
PARIS, FRANCE - JULY 04: Lee Radziwill and Bianca Brandolini d'Adda attend the Giambatista Valli Haute Couture Fall/Winter 2011/2012 show as part of Paris Fashion Week at Galerie De La Madeleine on July 4, 2011 in Paris, France. (Photo by Michel Dufour/WireImage)
PARIS, FRANCE - MARCH 07: Lee Radziwill and Michael Kors attend a cocktail and dinner hosted in honor of designer Michael Kors during Paris Fashion Week Fall/Winter 2012 at the Embassy Of The United States on March 7, 2011 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
Princess Lee Radziwill and Gilles Dufour at 'The Inspiration Party' In Benefit Of Amfar At Maxim's In Paris . (Photo by Bertrand Rindoff Petroff/Getty Images)
Alain Delon and Princess Lee Radziwill at Princess Lee Radziwill Awarded Knight in the National Order of the Legion of Honor. (Photo by Bertrand Rindoff Petroff/Getty Images)
Princess Lee Radziwill - 23rd antic fair (every 2 years) in Paris followed by a dinner to the benefit of the foundation 'Hopitaux de Paris - Hopitaux de France'. (Photo by Bertrand Rindoff Petroff/Getty Images)
UNITED STATES - FEBRUARY 02: Herbert Ross and wife Lee Radziwill arrive at Loew's Theater for the premiere of 'Boys on the Side.' Ross directed the movie. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - OCTOBER 05: Lee Radziwill joins her neice, Caroline Kennedy Schlossberg, at the Municipal Art Society gala at Grand Central Terminal. They turned out to celebrate the terminal's renovation. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
Lee Radziwill and Herb Ross during HBO Film Premiere of 'Women and Men: Stories of Seduction' at East Hampton Cinema in East Hampton, New York, United States. (Photo by Ron Galella/WireImage)
Lee Radziwill during Central Park Benefit at Plaza Hotel in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Patricia Kennedy Lawford, Princess Yasmin Khan, and Lee Radziwill (Photo by Ron Galella/WireImage)
Lee Radziwill (Photo by Jim Smeal/WireImage)
Lee Radziwill and Jack Warneke during Pierre Cardin Fashion Retrospective at Metropolitan Museum of Art in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Jackie Kennedy Onassis, John F. Kennedy Jr., Lee Radziwill, Christina Radziwill (Photo by Ron Galella/WireImage)
UNSPECIFIED, MA Â CIRCA 1975: Lee Radziwill photographed circa 1975 in Massachusetts. (Photo by PL Gould/IMAGES/Getty Images)
Lee Radziwill during 1st Annual Richard Rodgers Awards Dinner, 1974 at Pierre Hotel in New York, New York, United States. (Photo by Ron Galella/WireImage)
Lee Radziwill during Lee Radziwill Sighting on Madison Avenue - May 14, 1973 at Madison Avenue in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Lee Radziwill (Photo by Ron Galella/WireImage)
Lee Radziwill (Photo by Ron Galella/WireImage)
Jackie Kennedy Onassis and Lee Radziwill (Photo by Ron Galella/WireImage)
Lee Radziwill during Kennedy Family at the Onassis Beach House at Scorpios - August 1, 1970 at Athens Airport in Athens, Greece. (Photo by Ron Galella/WireImage)
13th June 1967: Princess Lee Radziwill, sister of Jacqueline Kennedy. (Photo by Reg Burkett/Express/Getty Images)
Princess Lee Radziwill (Lee Bouvier) sister of Jacqueline Kennedy in London's Savoy Hotel. She is in England to play the title role in a TV film, 'Laura' produced by David Susskind. (Photo by Dennis Oulds/Getty Images)
Children looking at birthday cake --- Image by ? Royalty-Free/Corbis
(GERMANY OUT) Die Ehrentribüne vor dem RathausSchöneberg während der Rede desamerikanischen Präsidenten John F.Kennedy: Prinzessin Lee Radziwill, RutBrandt, Kennedys Schwester Eunice Shriverund die Frau des amerikanischenStadtkommandanten, James H. Polk (Photo by Konrad/ullstein bild via Getty Images)
Princess Lee Radziwill (JackieKennedy's sister) congratulating Yves Saint-Laurent after presentation of his winter collection in Paris, july 30, 1962. (Photo by RDA/Getty Images)
7th June 1961: Jackie Kennedy (1929 - 1994), wife of president John F Kennedy, boards a BEA aeroplane at London airport. Accompanying her on the flight to Athens is her sister Lee Radziwill. (Photo by Jimmy Sime/Central Press/Getty Images)
UNSPECIFIED - OCTOBER 01: Jacqueline Bouvier (future Jackie Kennedy) and her sister Caroline Lee Bouvier (Lee Radziwill) in Venice, 1951 (Photo by Apic/Getty Images)
UNSPECIFIED : Caroline Lee Bouvier (Lee Radziwill) and her sister Jacqueline Bouvier (future Jackie Kennedy) on september 15, 1951 on boat to come back in USA after their travel in Europe (Photo by Apic/Getty Images)
Princess Radziwill (formerly Lee Bouvier), from back with face reflected in mirror. (Photo by Cecil Beaton/Condé Nast via Getty Images)
Lee Radziwill et le danseur russe Rudolf Noureev interviewés par un journaliste . (Photo by REPORTERS ASSOCIES/Gamma-Rapho via Getty Images)
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Things only got more complicated years later when Jackie got remarried to Greek shipping magnate, Aristotle Onassis. Radziwill had a close relationship with Onassis and even considered marrying him herself while JFK was still alive, but her sister argued against it.

Though she attended the wedding, Radziwill said her relationship with her sister was never the same afterward.

PHOTOS: JFK and Jackie Kennedy through the years

38 PHOTOS
John F Kennedy and Jackie O Wedding
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Jackie Kennedy's sister on JFK assassination: 'Finally, I'm free'
Sen. John F. Kennedy (D-MA) and his bride, the former Jacqueline Lee Bouvier, leave St. Mary's Catholic Church following their wedding in Newport, RI, September 12, 1953. Archbishop Richard J. Cushing of Boston officiated at the ceremony. (AP Photo)
Senator John F. Kennedy, D-Mass., is shown with his bride, the former Jacqueline Bouvier, leaving a Newport, RI church after their wedding on September 12, 1953. (AP Photo)
U.S. Senator John F. Kennedy, D-Mass., and his bride, the former Jacqueline Lee Bouvier, cut their wedding cake during a reception following thier marriage Sept.12, 1953 at Newport, R.I. (AP Photo)
Jacqueline Lee Bouvier and Senator John F. Kennedy (D-Mass.) will be married at a nuptial mass officiated by Abp. Richard J. Cushin of Boston in St. Mary's Church, Newport, R.I., September 12, 1953. Undated photo of Jacqueline Bouvier in her wedding gown. (AP Photo/Bradford Bachrach)
The engagement of Miss Jacqueline Lee Bouvier, 23, to U.S. Senator John F. Kennedy (D-Mass) has been announced by her mother and stepfather Mr.and Mrs. Hugh D. Auchincloss of Newport, R.I., June 25, 1953. Undated photo. Associated Press photo from Glogau. (AP Photo)
Sen. John F. Kennedy, D-Mass., and his fiancee, Jacqueline Bouvier, prepare a sailfish boat for sailing at Hyannis, Mass., June 27, 1953. (AP Photo)
Sen. John F. Kennedy, D-Mass., and his fiancee Jacqueline Bouvier, 23, pose on the lawn of the Kennedy residence during their weekend visit at Hyannis, Ma., on June 27, 1953. The couple announced their engagement June 23. (AP Photo)
U.S. Senator John F. Kennedy (D-Mass) and his fiancée Miss Jacqueline Bouvier, 23, smile happily as they prepare for a game of tennis at the Kennedy residence at Hyannis, Massachusetts on June 27, 1953, where they are spending the week-end. Miss Bouvier is from Newport, R.I., and McLean, W. Va. The couple's engagement was announced on Tuesday. (AP Photo)
Jacqueline Tortorice, second from right, of Los Angeles, Calif., leans forward Tuesday, May 27, 1997, at the John F. Kennedy Library and Museum in Boston as she examines the wedding gown worn by Jacqueline Bouvier for her marriage to John F. Kennedy, which took place in Newport, R.I., on Sept. 12, 1953. Included in the exhibit are the red woolen suit Mrs. Kennedy wore during her televised tour of the White House, as well as film footage and numorous historic objects pertaining to the Kennedy Administration. (AP Photo/Steven Senne)
First lady Jacqueline Kennedy raises a hand to her hair as she poses at the White House with officials of the American National Theater and Academy, March 12, 1963. From left to right: Mrs. Virginia Murray Bacon, president of the Washington chapter of ANTA; Ms. Peggy Wood, president of ANTA; Mrs. Kennedy; Stanley Young, Executive Committee of ANTA; and Mrs. Virginia Royall Inness-Brown, president, Greater New York chapter of ANTA. (AP Photo)
Massachusetts, USA, 1950's, President of the United States of America John F, Kennedy pictured as a young man with his wife Jackie Kennedy (Jacqueline Bouvier) early in their marriage (Photo by Popperfoto/Getty Images)
Massachusetts, USA, 1950's, President of the United States of America John F, Kennedy pictured as a young man with his wife Jackie Kennedy at home (Photo by Popperfoto/Getty Images)
NEWPORT, RI - SEPTEMBER 12: John F. Kennedy and Jacqueline Kennedy outside St. Mary's Church after their wedding on September 12, 1953. (Photo by Charles F. McCormick/The Boston Globe via Getty Images)
UNSPECIFIED - CIRCA 1754: US President John Kennedy, President Charles de Gaulle and Jackie Kennedy in Paris at the Elysee Palace May 31, 1961 (Photo by Universal History Archive/Getty Images)
1956: Waiter clearing dishes fr. table in front of actor David Niven (3R) sitting next to Sen. Jack Kennedy's wife Jackie (2R) w. others dining at society gala sponsored by wife of US Amb. to Cuba, in the ballroom of the Waldorf Astoria Hotel. At the far left is Jackie's sister Caroline Lee Bouvier (later Canfield, Radziwill, and Ross). (Photo by Yale Joel/The LIFE Picture Collection/Getty Images)
March 25, 1958: Sen. Jack Kennedy cuddling his darling baby daughter Caroline who is smiling as her mom Jackie looks on in delight while relaxing on bed at home. (Photo by Ed Clark/The LIFE Picture Collection/Getty Images)
JULY 20: John F. Kennedy and Jacqueline Kennedy. (Photo by Charles McCormick/The Boston Globe via Getty Images)
Sen. Jack Kennedy slyly lending an ear to his wife Jackie's giddy whisper as they sit together at table during cocktail hour before dining at society gala sponsored by wife of US Amb. to Cuba, at the Waldorf Astoria Hotel. (Photo by Yale Joel/The LIFE Picture Collection/Getty Images)
American future First Lady Jacqueline Kennedy (1929 - 1994) and her daughter Caroline pause on the stairs of their vacation home and look back down, Hyannisport, Massachusetts, September 1960. Ms. Kenney wears a trenchcoat and a flower-print scarf over her hair while Caroline is dressed in a overalls. (Photo by Alfred Eisenstaedt/The LIFE Picture Collection/Getty Images)
Jackie Kennedy and friends, circa 1960s. (Photo by Fotosearch/Getty Images).
CIRCA 1960s: Former First Lady Jacqueline Kennedy enjoys herself at a picnic circa the 1960s. (Photo by Michael Ochs Archives/Getty Images)
DISTRICT OF COLUMBIA, UNITED STATES - 1961: President Kennedy (R) with First Lady Jackie (L) (in fur-trimmed suit designed by Oleg Cassini) at his inauguration. (Photo by Leonard McCombe/Life Magazine/The LIFE Picture Collection/Getty Images)
PARIS, FRANCE - UNSPECIFIED DATE: American president John and Jackie Kennedy at the American Embassy during 1961 in Paris, France. (Photo by S010/COLLECTION SALINGER/Gamma-Rapho via Getty Images)
The newly-elected President John Fitzgerald Kennedy with wife Jackie after giving the traditional acceptance speech. USA, November 1960 (Photo by Mondadori Portfolio via Getty Images)
Frank Sinatra escorting Jacqueline Kennedy to her box at a gala, held at the National Guard Armory in Washington DC, the night before the inauguration of President John F. Kennedy, 19th January 1961. The gala was staged by Sinatra to help pay off the campaign debts of Kennedy and the Democratic Party. (Photo by GAB Archive/Redferns)
Portrait of American First Lady Jacqueline Kennedy (1960 - 1999) in the Red Room of the White House, Washington DC, January 15, 1962. During the filming of a CBS News Special program called 'A Tour of the White House with Mrs. John F. Kennedy,' she stands in front of an Alfred Wordsworth Thompson painting of the Civil War battle at Balls Bluff, Virginia. (Photo by CBS Photo Archive/Getty Images)
The President and Mrs. Kennedy attend a White House Ceremony February 19, 1963. (Photo by National Archive/Newsmakers)
First Lady Jackie Kennedy speaks to a guest while attending a White House ceremony January 8, 1963 in Washington, DC. (Photo by National Archive/Newsmakers)
UNITED STATES : A contemporary report ran: ?Caroline, five, moves into the big time. Big day for a small girl. The day she moved from the junior to the senior class. The day she rode not her own pony, Macaroni, but mother?s horse, Rufus, with her mother. The girl is Caroline Kennedy, five-year-old daughter of America?s President John Kennedy and his wife Jacqueline.? President Kennedy was assassinated later that year, on November 22. (Photo by SSPL/Getty Images)
18th October 1968: Millionaire shipping magnate Aristotle Onassis (1906 - 1975) with his wife Jackie (Bouvier Kennedy, 1929 - 1994). (Photo by Central Press/Getty Images)
Jackie Kennedy Onassis, Caroline Kennedy (left), John F. Kennedy, Jr., and Lee Rodziwill (Photo by Ron Galella/WireImage)
Jackie Onassis, Anthony Radziwill, and Tina Radziwill (Photo by Ron Galella/WireImage)
Jackie Onassis during Jackie Kennedy and Family Shopping in Capri - August 24, 1970 in Capri, Italy. (Photo by Ron Galella/WireImage)
Jackie Kennedy Onassis in Capri, Italy. (Photo by Ron Galella/WireImage)
Jackie Onassis (Photo by Ron Galella/WireImage)
Jackie Onassis with son John Kennedy Jr during Jackie Onassis Sighting at the Philharmonic Hall - December 13, 1971 at The Philharmonic Hall in New York City, United States. (Photo by Tom Wargacki/WireImage)
Washington, D.C. May 14th 1976. Jackie Onassis and Alexandrje Orfila at The Kennedy Center (Photo by Tom Wargacki/WireImage)
Jackie Onassis and Alex Orfila during OAS Party following the Kennedy Center Gala at Kennedy Center in Washington D.C., United States. (Photo by Ron Galella/WireImage)
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This video includes a clip from The New York Times and images from The U.S. National Archives and Records Administration and Getty Images.

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