Maybe late to the party, but since I didn't see it mentioned, I would recommend the podcast The Last Podcast on the Left [1]. Three guys research true crime and bizarre stuff such as cults [2] and serial killers [3]. They tell the facts and their person take with a good dose of humour.
[1] https://www.lastpodcastontheleft.com/
[2] https://m.soundcloud.com/lastpodcastontheleft/episode-300-jo...
[3] https://m.soundcloud.com/lastpodcastontheleft/episode-317-de...