Katherine 'Kay' Murphy Halle (October 13, 1903 – August 7, 1997) was an American journalist, broadcaster and socialite.

She was born in Cleveland, Ohio, the daughter of Blanche (née Murphy) and Samuel Horatio Halle.

[1] Halle was a department store heiress, World War II intelligence operative with the Office of Strategic Services, and intimate confidant and/or mistress of many luminaries of the 20th century, including George Gershwin, Randolph Churchill, W. Averell Harriman, Joseph P. Kennedy, Walter Lippmann, and Buckminster Fuller.

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