Their line of questioning in both interviews since the first episode suggested that Cohle was their main suspect now, so that reveal wasn't any kind of a surprise. But no, I don't think he was involved. I think he made the discovery that this went far deeper than he originally thought, became obsessed with solving it, and probably dropped off the grid again to do so. Can't be too certain about anything with this show, though. It's certainly made us question Cohle's credibility time and again (and you could probably say the same for Hart too).
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