Robert Vaughn 1932 - 2016
He had a very (very) small role in The Ten Commandments (1956)
Which we all know starred Charlton Heston who was in many Sherlock Holmes stories.
Charlton Heston (1923-2008)
Heston was Sherlock Holmes in stage and in film in The Crucifer of Blood.
Howard, thanks for the additional info.
Robert Vaughn at least once played Holmes on The Hollywood Palace.
Vaughn was Holmes, Phyllis Diller was Moriarty and Charlie Manna played Watson.
Bringing Robert, as Howard suggests, within One Degree of Sherlock Holmes.