I swear that I have seen this episode, or one just like it, many seasons ago in the B&W versions of 'Gunsmoke'. I can only hope that the earlier episode was better than this offering.
The story, if you can call it that, is centered around a man named Jud Pryor that has more or less adopted an Indian boy named Wonder. Jud, a drifter, is seeing this young woman, Annie Franklin, which is much to the dislike of her brothers, Deke and Ed. So the brothers make a plan with Bo Warrick to make Pryor leave their sister alone and high-tail it out of the area.
But when one of the brothers has to kill Bo, Deke schemes a story that Jud was the one who killed Bo so that the Marshal can hang him. But even that plan goes awry.
It was never fully explained why the Indian boy was even in the story. The only thing that makes sense is that he was written in to kill time on this uninteresting story. When the best thing about the episode is Festus and Doc talking about crawdads then you know this was not an entertaining show.