El Diablo donned a mask and cape to fight criminals and assist the law whenever possible. In 1879, he was one of several heroes, along with Bat Lash and Jonah Hex, who assisted Sheriff Ohiyesa Smith in overthrowing Tobias Manning's control of the Oklahoma town of Elkhorn. In this, they were also aided by three time-traveling members of the future Justice League.
JUSTICE LEAGUE UNLIMITED #19 "The Justice Rangers Rides Again".Edit
Wonder Woman, Elongated Man and Vigilante track a sinister time traveler back to the Old West. But it's going to take the help of Jonah Hex, Bat Lash and El Diablo for them to stand a chance against the Time Commander! Guns are a 'blazin' in "The Justice Rangers Ride Again!"