us. that the blood on the bag was a different type in the victims. but, silently, patiently, that dna waited. in 1999, it was a whole new scientific world. >> back in 83, they had obtained a blood sample from the husband. it was his blood that was found on the last. bag >> inside a closet? >> inside. closet >> though, of course, that was also gregory's closet for more than four years. he'd only been out of the place a couple of months. boyd decided to have all the evidence retested, and, now gregory's dna turned up in several places. a tiny spot on the plaza doorknob, on a rear sliding glass door, and in a powder room sink. the amount was miniscule. so, perhaps, it meant nothing. gregory could've left it there when he lived in the house, except >> the bathroom sink had her blood and his blood mix.