David Keith McCallum (19 September 1933 – 25 September 2023) was a Scottish actor and musician, based in the United States. He gained wide recognition in the 1960s for playing secret agent Illya Kuryakin in the television series ''The Man from U.N.C.L.E'' (1964–1968). His other notable television roles include Simon Carter in ''Colditz'' (1972–1974) and Steel in ''Sapphire & Steel'' (1979–1982). Beginning in 2003, McCallum gained renewed international popularity for his role as NCIS medical examiner Dr. Donald "Ducky" Mallard in the American CBS television series ''NCIS'', which he played for 20 seasons until his death in 2023. In film roles, McCallum notably appeared in ''The Great Escape'' (1963), and as Judas Iscariot in ''The Greatest Story Ever Told'' (1965).
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