>> bye, little girl. >> it really puts a fire under you to realize, you know, what we can do as investigators. you know, it lets other perpetrators know if you think you committed a perfect crime, you didn't leave dna or fibers or habs behind, they're still going to get you. >> and yet mac hasn't entirely closed out the case file. he believes art ream may have buried more bodies by that riverbank. he's opened two investigations. >> pandora's box still has a few things in it, so. >> yeah. >> whatever happens in the future, mac says getting justice for cindy was not just the case of a lifetime, it was a lifetime's satisfaction. >> this is the best thing that's ever happened to me, and that's including even the birth of my kids. to be able to give something of this magnitude back to a family.