>> this is where the confusion with all of us came in. i got back from hotlanta records probably about 9:00, 9:30. >> but there's no one to corroborate that, even if his mother were still alive. wayne said she probably didn't see him come in. prosecutor jack mallard. >> he was out that night, no question in my mind. he was not at home. he was out and about. >> less than six hours after henry said he saw williams and cater here, police heard a splash under this bridge. cater's body washed up downstream two days later. 30 years ago, there was no dna testing. now there is. and so new evidence. remember those two human hairs found inside 11-year-old patrick baltazar's shirt? in 2007, the hair fragments were sent to the fbi's dna laboratory in quantico, virginia. the result? the lab said it found this dna sequence in only 29 out of more than 1,100 samples of african-american hairs in its database. less than 3%. most important, wayne williams' dna had the same sequence. >> i think -- i don't think they said it was a match. they said they could not rule out whomever the hairs were from as being the possible donor. >> the fbi's hal dedman, a dna expert, said this finding is as