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obviously, ladies were very cold cases. there's are getting hotter and hotter additional indictments now can you just walk me through this new physical evidence that you say allegedly connect heuermann, please. additional murders is it is it dna base? >> so it's a number of things i think key evidence is dna. we recovered a hair from jessica taylor. that hair matches the dna profile of the defendant. and then with regard to sandra costilla in 1993, to two hairs were recovered from her a female and a male. the male hair matches the dna profile of the defendant and the female hair matches the dna profile of a woman who was cohabitating with the defendants shortly before the murder does that mean we shouldn't dissipate a potential co-defendant? no, i think it's something known as transfer dna when if you live with some somebody, their dna can get all get on your clothes

Transcripts for CNN CNN Newsroom With Fredricka Whitfield 20240604 17:53:00

lawyer, former prosecutor, and also former court tv reporter, beth great to see you. so what does all this mean? >> nice to see you too. allison? well, it's hopeful for scott peterson that the duct tape will now yield a dna profile. in the past 20 years since it was tested, dna testing, the technology has become more sophisticated, so maybe there will be an opportunity to get a profile but the question is, will it be laci is profile scott's profile or someone else, but there's one piece of duct tape is it was already tested as you mentioned and it is the only piece that the judge of the evidence they wanted retested or tested for the first time that the judge found was connected a knock two laci and the crime that it warranted further testing, but everything else was just it was just too speculative. and so she did not allow any other items to be tested, but that's if there's dna belonging to someone other

Cold case detectives vow to solve historic sex crimes

Forensic science advances are helping police to secure convictions in unsolved cases spanning 50 years.

Arizona Supreme Court takes up DNA ruling in Allison Feldman murder

The Arizona Supreme Court will hear arguments regarding whether crucial DNA should be allowed in the trial of the man accused of killing Allison Feldman in 2015.

Transcripts for CNN Forensic Files II 20240604 08:40:00

that was a full profile, what we call a major-minor. the profile on the candy wrapper was a great quality profile. narrator: investigators knew that killers who resort to the kind of overkill seen in sierra's murder have usually killed before or have at least committed violent crimes, so they were confident they'd find a dna match to their killer in codis, the national dna database. well, i think we're going to solve it immediately. i think, "okay, if we put this in codis and we get a hit, then case solved." narrator: but it was not to be. despite the high quality of the killer's dna profile, there were no matches. i was very aware there was not a hit in codis. that was very frustrating for us, and i know it's frustrating for the detectives, as well. ♪ narrator: now investigators backtracked sierra's final hours, and true to her freewheeling lifestyle,

Transcripts for CNN Forensic Files II 20240604 07:28:00

had no idea detectives were following him, discarded a paper coffee cup, which was seized and immediately tested for dna. detectives and analysts waited as their case, now more than 30 years old, hung in the balance. as i'm going along through the series of markers, they're matching, and so it's almost like winning a lottery, and you're saying, "okay, that's a match. that's a match." scharf: the odds of this not being william talbott was 1 in 180 quadrillion. you would have to have 36 million planets with the same population as earth to find william talbott with that dna profile. narrator: old-fashioned forensics also sealed talbott's fate. his palm print matched the partial palm print lifted from jay's van way back in 1987.

Transcripts for CNN Forensic Files II 20240604 07:25:00

in the same way as law-enforcement databases like codis. moore: in codis, you're looking for that exact match, but in genetic genealogy, we can go way beyond that and use those hundreds of thousands of markers to predict second, third, fourth cousins and beyond. narrator: however, there are serious concerns about law enforcement having access to the dna of people who have never committed a crime. that problem can be resolved if people are told their dna is going to databases used by police, which is exactly what a company called gedmatch did. gedmatch posted a notification on their site alerting their users that law enforcement was using the database, and that was what i needed to allow me to finally make the decision to help law enforcement. narrator: in 2018, investigators took the dna profile from jay and tanya's case

Transcripts for CNN Forensic Files II 20240604 08:27:00

at the time of her murder. because dna technology over the years has gotten more sensitive, we can now develop dna profiles from just a few skin cells. so, six or seven cells, we can get a dna profile. narrator: using a process called y-str dna, which targets the y chromosome confined to males, analysts lifted a dna profile from chanin's neck and face. the profile matched the "y" profile for clay starbuck and any of his male children. narrator: two of the starbucks' children were adult males, and both had solid alibis for the time of the murder. that left only one person -- clay starbuck. the dna profile that we got left little doubt in our mind that it was clay starbuck. narrator: but clay had an explanation for his dna. he used to live in the house. of course his dna would be there. analysts disagreed.

Transcripts for CNN Forensic Files II 20240604 08:39:15

DNA collected from chewing gum leads to arrest and conviction in 1980 cold case murder

DNA found in a piece of discarded chewing gum led to the arrest and conviction of a suspect in a 1980 cold case murder in Oregon, prosecutors say.