“The Gunner from Gehenna”
by L. Ron Hubbard
Publication date: April 1949
Original publication: Giant Western
Story description: The Gunner breaks out of jail and returns to take revenge on the man who helped put him away. But his “victim” manages to cheat death and turn the tables on him.
Currently available as part of the Stories from the Golden Age series, in the title Shadows from Boot Hill.