One of the episodes of Gunsmoke where Festus makes an early appearance (he’s not yet Dillon’s deputy) has Festus’ cousin Daisy show up for a visit. A man that Festus had beaten in a fight at the beginning of the episode gets revenge on him by raping his cousin. The way it’s revealed is showing the man coming to the place where she’s staying and advancing on her threateningly-- end scene. The next scene shows Daisy sitting around a table with Festus, Dillon, Doc and Miss Kitty. For a second you have no idea what was supposed to have happened until Daisy says “what man will want me now that my virtue has been stolen?”
The episode ends with Festus tracking down the man and murdering him. The last scene is of Dillon arresting Festus, but saying to Doc “don’t worry, no jury in Dodge City will convict him”. Some of those Gunsmoke episodes, especially the early ones, were dark.