Question: Which American actor, screenwriter, poet and singer died in 1999 and acted in Amok Time?
Sentence (from "Amok Time"): It was the first episode to air (though not the first filmed) featuring regular cast member Walter Koenig, as the ship's navigator, Ensign Pavel Chekov, and also the first one to list DeForest Kelley as Dr. McCoy in the opening credits.
Relevant evidence: Yes