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The second criminal known as Jack of Spades was a member of the Ace of Spades' organization.

When Ace's other associate Briar Rose was a fugitive, Ace sent Jack of Spades to kill her. Jack waited at Briar Rose's safehouse and planned to ambush her. Unbeknownst to Rose and Jack, she had been observed by Sam Catchem, who followed her. Catchem was present when Jack attempted to shoot Rose, and Catchem shot and killed Jack.

Subsequently, Dick Tracy disguised himself as Jack of Spades in order to infiltrate Ace of Spades' headquarters.