and bob durst's eyes are not blue. mills, gomes didn't come forward until months after the incident. >> what we don't wanna do is just take something that's, you know, sensational and plug that person into the midst of an investigation that may or may not have anything to do with him. >> reporter: but the investigation continues. and some, like birkbeck, believe there may be more. >> i've never said definitively that he was a serial killer. what i said was that there's so much out there about him that clearly there's something going on here. and that law enforcement needs to look into it and thankfully they are doing it now. >> reporter: waste of time, said dick deguerin. >> well, there's no evidence. and to think, you know, the -- the -- they have to have a theory that he's some kinda serial killer. he's not a serial killer. >> but the notion of robert durst as a serial killer has come up. you know, a guy who -- >> well, sells. it sells magazines. it sells books and causes people to turn on their tvs. well, there's no

when you durst do it, then you were a man. and to be more than what you were, you would be so much more the man. nor time nor place did then adhere, and yet you would make both. they have made themselves and that their fitness now does unmake you. i have given suck, and know how tender tis to love the babe that milks me. i would, while it was smiling in my face, have plucked my nipple from his boneless gums and dashed the brains out had i so sworn as you have done to this. if we should fail? we fail! but screw your courage to the sticking place and we'll not fail. when duncan is asleep, whereto the rather shall his days hard journey soundly invite him, his two chamberlains will i with wine and wassail so convince that memory, the warder of the brain, shall be a fume, and the receipt of reason a limbeck only. when in swinish sleep their drenched natures lie as in a death, what cannot you and i perform upon the unguarded duncan? what not put upon his spongy officers who shall bear the guilt of our great quell? bring forth men, c

. >> reporter: almost everywhere robert durst goes, mystery follows.bout this reeked of murder. >> reporter: a murdered best friend. a dead neighbor. >> it's hard to understand.