In 18__ , in some western local.

The story goes that he was confronting several bad guys in the middle of the town main street , after sun down.

When he heard a shot from his 6:00.

This guy wheels around , shoots at the shooter and drops the guy.

Turns out the shooter was helping the lawman and ended up dying.

I read about in a biography then five years later they acted it out in a movie

Hickok. Killed his own backup. Quit LE right after.

Thank you, gotta go read about it again