This is a specialty of mine. I liked the ones that you’ve mentioned so you’ve probably got similar tastes. You’ll probably like “To Live and Die in LA”, also all the seasons of “Someone knows something“ have been good (by CBC in Canada). Counterclock is also good. Oh, and if you liked Serial, “S-Town” by the same people is great and totally different - that’s up there with my favourite of all time actually. To mix it up with different countries, other good ones are West Cork (Irish), Death in Ice Valley (BBC collaboration with Norway), Teacher's Pet (Australian- and the case is currently in the courts I believe) and the Doorstep Murder (Scotland). That’ll keep you going for a while.
