Kathleen "Kick" Kennedy (February 20, 1920--May 13, 1948) was the daughter of U.S. politician Joe Kennedy. In 1938, when Kick was 18, her father was appointed U.S. ambassador to the United Kingdom and moved the entire Kennedy clan to London with him.
From day one, Kick was the toast of London society, and considered one of the top debutantes of the year by the English media. In 1938, she met William "Billy" Cavendish, the Marquis of Hartington, with whom she developed a relationship. But their burgeoning romance was shattered by WWII, and Kick was forced to return to the U.S. without Billy.
Four years later, she was back in England. Despite strenuous objection over their religious differences from her mother Rose Fitzgerald, she married Billy in May of 1944 with only her brother Joseph Kennedy, Jr. as the sole family witness.
In August 1944, both Joseph Jr. and Billy were killed in combat within days of each other; Kick had been married for just five weeks. She decided to continue living in London.
In 1948, Kick fell in love with another British aristocrat, Earl Peter Fitzwilliam, an Anglican and a married man. Again, Kick's mother expressed disapproval of her involvement with Fitzgerald and threatened to disown Kick if she married him. Before they could marry, Kick and Fitzwilliam were tragically killed in a plane crash that year whilst en route to the French Riviera.