No its not Doyle or Slim....its Moss
Sounds like a cool old bugger:
Moss was the original, a cold-as-steel, tough-as-nails old-school gambler who never flinched under pressure, whether it was from a big pot or a gun barrel at his temple. He carried a weapon himself at all times, using it on more than one occasion while following the Texan trail from one poker game to the next.
Read full story here..
http://www.wisehandpoker.com/bios/johnny-moss.php