The Biggest Unanswered Question in True Detective (So Far)

Fans of the series might recall the biker gang leader, who, in episode four of the series, was last seen taped up behind the seat  of Cohle's pickup.  Later on, Hart asks what happened to the guy.  Cohle says something like, "I left him taped up in a ditch over there."  So what then?   Cohle couldn't turn him over to the cops, since Cohle and Hart were accessories to any number of crimes, including murder.  So that's not what happened.  Did Cohle kill him?  Did he leave him taped up in the ditch for land-roving gators to find?  Inquiring minds want to know.  Of course it's always possible that this was explained and I missed it.  Sometimes I do miss things.  Often, in fact.