A noted acrobatic criminal who had encounters with Captain America on more than one occasion. He was assassinated by Moonstone on orders from the Secret Empire. His brother, Michael Keane, later assumed the mantle of the Tumbler[1].

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  1. Captain America #291
  2. Marvel Legacy: The 1960s Handbook #1
  3. Official Handbook of the Marvel Universe A-Z hardcover Vol. 12

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