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Actor Robert Vaughn, portrait , United Kingdom, 1991. (Photo by Martyn Goodacre/Getty Images)

Actor Robert Vaughn, portrait , United Kingdom, 1991. (Photo by Martyn Goodacre/Getty Images)

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Robert Vaughn as Napoleon Solo and David McCallum as Illya Kuryakin in popular TV series 'The 'Man from U.N.C.L.E.', circa 1965. (Photo by Silver Screen Collection/Hulton Archive/Getty Images)

Robert Vaughn as Napoleon Solo and David McCallum as Illya Kuryakin in popular TV series 'The 'Man from U.N.C.L.E.', circa 1965. (Photo by Silver Screen Collection/Hulton Archive/Getty Images)

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circa 1965: Portrait of American actor Robert Vaughn seated among flower bushes while smiling with his hands crossed. (Photo by Darlene Hammond/Hulton Archive/Getty Images)

circa 1965:  Portrait of American actor Robert Vaughn seated among flower bushes while smiling with his hands crossed.  (Photo by Darlene Hammond/Hulton Archive/Getty Images)

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Robert Vaughn during 44th Monte Carlo Television Festival -Hustle Photocall at Japonese Gardens in Monte-Carlo, Monaco. (Photo by Toni Anne Barson Archive/WireImage)

Robert Vaughn during 44th Monte Carlo Television Festival -Hustle Photocall at Japonese Gardens in Monte-Carlo, Monaco. (Photo by Toni Anne Barson Archive/WireImage)

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Robert Vaughn during 2004 TV Quick Soap Awards - Arrivals at Dorchester Hotel in London, Great Britain. (Photo by Jon Furniss/WireImage)

Robert Vaughn during 2004 TV Quick Soap Awards - Arrivals at Dorchester Hotel in London, Great Britain. (Photo by Jon Furniss/WireImage)