Recommendations for deep-dive, single-case true crime podcasts on cold cases

[Aubrey.R]

I've burned through all the major true crime podcasts like "Serial" and "My Favorite Murder" and I'm now searching for lesser-known, well-researched series that focus on a single case per season with a respectful tone towards the victims. I recently finished "The Teacher's Pet" and was impressed by its depth, but I'm struggling to find something of similar quality that hasn't already been covered everywhere. For fellow enthusiasts, what are the best true crime podcasts you've discovered that prioritize thorough journalism over sensationalism? I'm particularly interested in recommendations for deep dives into unresolved or cold cases, especially those with recent developments or ethical reporting that brings new attention to forgotten stories.