my guess is they got the right guy in 95, but there is more than one. so it is like a cult. they probably killed him and found all the evidence that tied him to it, so they closed the case. then something else happened in 2002 that pointed to multiple killers, but probably because it pointed in the "wrong" direction, it was buried, and mccaughnahey and harrelson were some sort of fallout. harrelson may not have been so wittingly. now the 2010 murder brings it back to light, but all the records were destroyed (iirc) so the black detectives are trying to get to the bottom of what happened in 2002