Tip - "Ellery Queen" The Adventure of the Disappearing Dagger (TV Episode 1976) - IMDb

Directed by Jack Arnold. With Jim Hutton, David Wayne, Gary Burghoff, Ronny Cox. An elderly amateur criminologist finally figures out how a five-year-old "locked-room" murder was committed, and is murdered by the killer before he can alert Inspector Queen. Ellery takes up the challenge himself. The criminologist had first implicated an airline pilot, because he was flying the plane where the murder was committed and had the opportunity to toss the murder weapon out the window...
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