Rust eventually reveals to Maggie that he knows Marty is cheating on her which leads to her splitting up with him as well as ends the partnership of Rust and Marty. It looks like something may happen next week with Cohle and Maggie.

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It's Woody Harrelson's character. Here's what specifically solidified my belief that the writer is sprinkling clues setting the killer up as an existing character: The present-day detectives pointedly asked Hart "Was Cohle the only one pushing to keep the case, or did you as well?" Add to that their commanding officer said Hart is the sole thing keeping Cohle around at that point? They don't exactly seem too friendly, so that's a bit strange by itself. With this Satanic Task Force threatening to steal the case, Hart must realize pushing to keep it would arouse suspicions. But Cohle? Cohle is very clearly obsessed with this case. Hart knows he'll have somebody else desperate to keep it, someone with a reputation for being outspoken and demanding.

Here's the other couple things: (Weirdo, that death painless nonexistence, absolving sins of parenthood, so forth) - Yellow King. What's a badge's color? Gold... or yellowish. Plus, they've shown the shield rather pointedly, being the shape of Louisiana state - which, at some angles, could appear as a crown. So... I see Yellow King as possibly referencing a cop.

Hart also has an anger problem. Especially if the topic is cheating on his wife. What's more, he seemed intent on 'saving' an underage hooker. Whereas those scenes with Cohle getting the pills from a hooker, and turning her down for sex? They seem awfully out of place. Just bizarre - it just seems like something to set up later, to say "Ha! Look there, see? How could you think he did it when we made it so obvious there that he sees himself above sex/prostitutes/impulsiveness. But Harrelson's character? He's a rage fiend!' Having this bizarre, insane guy with nutty views, an admitted killer of at least four people, no less! Then there's a seemingly 'normal', average family man - yet the more relatable and normal of the two is really the viscious psychopath/killer. Like when Cohle had dinner with Hart, kid asks if Cohle ever shot someone and that their dad never had. If either of them were a serial killer, it seems unimaginable it'd be Hart over Cohle.

Add to that the stuff about "For the good of the family... Have to disconnect, separate this horrific shit from my kids and family."

Biiiiiiiiiigest thing of all - the church. I watched it a couple times, and it was weird what they did with Cohle... Comments about how he thinks the visions are all insanity, until stuff like that happened. How he goes right to this damn mural, covered with brush and mostly obscured, like he knew it was there - just like the stick figure he found in the barn. Odd. Then I remembered this crucial bit - Cohle wanted to go to the church immediately after the bunny ranch. It was Hart who said, "Hey, let's hit the Johns first, the church can wait until Monday." I think he went there during the weekend, thus not wanting to go there right away, and why he left the in-laws to "follow up on a lead" '- having done the mural himself after seeing the church flier to deflect blame.

There's the final aspect of why we're even revisiting these detectives and this case 19 years later. I think it has less to do with direct ties to this case, and more they suspect it is one of the two detectives. Otherwise, why not just question them together? Yeah, they had a falling out, whatever. You question suspects separately. If you're mining for information, for details, from something two decades old, you get the story from both of them together so they can fill in bits and pieces, maybe remember what one forgot. Plus, this case we're reexamining was supposedly solved... if the killer is still out there and they fingered an innocent guy, that sure supports one of the cops being the killer and framing someone by planting all the pieces needed while preventing suspicion and incriminating evidence from falling on himself.

Edit to add: One last thing, that being the unwavering certainty that this season is a one-off; next year, different case *and* different actors/detectives. It's way too early and circumstantial to use that as proof, but to be so definitive this'll be American Horror Story type of 'new year, new show' kind of adds credence to the end of this case being something that ensures we won't see these guys again... at least in my mind.