I've listed to a ton, some are ongoing and some were a limited series dedicated to one specific case/subject:
Cold
The Vanished
Scene of the Crime
Trace Evidence
The Trail Went Cold
Voices for Justice
Someone Knows Something
Uncover
Up and Vanished
Atlanta Monster
Monster: DC Sniper
Without Warning
Culpable
There's one I listen to that is a guilty pleasure called Into the Killing. The guy also has another YouTube show called Criminally Listed. It's not a bad show but the dude's voice and cadence is like....unintentionally hilarious. If you listen to it for the first time, you'd think it was a stoner who just decided to get into the podcast game but he actually has a decent enough following.