Lawrence Montaigne (February 26, 1931 – March 17, 2017) was an American actor, writer, dancer, and stuntman. As an actor, he was known for his appearances on many 1960s television shows. He was particularly associated with his two roles on Star Trek—the Romulan Decius in "Balance of Terror" and the Vulcan Stonn in "Amok Time"—as well as his role as Haynes in The Great Escape. (Via Wikipedia)