John Allen and “Cockeyed” Frank Loving were two sporting men in Trinidad, Colorado in the spring of 1882. Both were noted shootists—and on April 15, they turned their guns on each other.
Initially the dispute was over loans, but then they argued over a card game. Both armed themselves and began opening up; over the next several minutes, friends and lawmen took away their guns, only to see the guys get new weapons. Finally, Allen put a fatal bullet into Loving’s back. He was acquitted of murder and later became a preacher.