I dunno if they're really appropriately considered mysteries for the most part, though, as the cases mostly seemed to be 'we probably know who did it but can't prove it legally', rather than truly being a mystery.
Like... Episode 2, the yandere husband obviously murdered her because she was going to divorce him, and then later cuddled with her skull. Episode 4, Alonzo was killed in a fight that broke out over him scoring with that girl, and his friend who 'got lost looking for cigs' witnessed it and is hiding it because he feels somehow responsible (the boots/hat are where they are because someone threw them out of the passenger window while trying to drive out of there at top speed), and Episode 5 just isn't even a mystery, it's just a woman murdering her husband and daughter and getting away with it because she burned their bodies. I guess Episode 1 counts as a mystery, because there is the question of who in that stock business, or what dirty politician higher up, had Rey killed, but I'm more accustomed to the kinds of mysteries where people disappear and there's only scant evidence of what may have happened to them, rather than the kinds where you know what happened but can't legally prove it.