John Dall (May 26, 1918 – January 15, 1971) was an American actor.

Primarily a stage actor, he is best remembered today for two film roles; the cool-minded intellectual killer in Alfred Hitchcock’s film Rope, and the trigger-happy lead in the 1950 noir Gun Crazy.

He first came to fame as the young prodigy who comes alive under the tutelage of Bette Davis in The Corn Is Green, for which he was nominated for the Academy Award for Best Supporting Actor.

Dall was born John Jenner Thompson in New York City, New York, the second son of Charles Jenner Thompson, a civil engineer, and his wife Henry (née Worthington). Dall died in Hollywood, California. Sources indicate he died of a heart attack.

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