killings of melissa barthelemy, amber waterman and amber costello. and he s the prime suspect in the death of a fourth woman. that investigation is continuing with regard to maurian brainard barns. and we feel confident that we re going to eventually be able to charge that murder. reporter: but those four women are among 11 sets of human remains scattered across the south shore of long island between 2010 and 2011. can they link him to the other seven? i think that, short of a confession maybe through let s make a deal, it s very unlikely that they would be able to link those to him for endsically. it s too much time. rex heuermann, an architect, i m an architectural consultant, i m a troubleshooter, born and raised on long island. reporter: in addition to owning and running an architecture firm, the 59-year-old is married and has two children. the only way they can keep