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During the 6th of December, 1991, Jennifer Harbison and Eliza Thomas, both 17, were closing up at the yogurt store where they were employed. Staying behind for a lift were Jennifer's sister, 15-year-old Sarah Harbison, and Sarah’s friend, 13-year-old Amy Ayers.

Moments before 12 AM, a fire at the shop drew emergency crews, who found a horrific scene: the four girls had been bound, murdered, and showed signs of sexual assault. The configration destroyed nearly all evidence, aside from a shell casing that had rolled into a drain and minute samples of DNA, including material beneath Amy Ayers' nails.

The Case That Shook a City

The yogurt shop murders profoundly shook the community in Austin and evolved into one of the most infamous long-lingering investigations in the United States. After years of dead ends and wrongful convictions, the murders ultimately led to a U.S. law approved in the year 2022 that permits families of the deceased to request dormant cases to be reopened.

However the killings continued to baffle investigators for over three decades – before this development.

Significant Progress

Police authorities disclosed on this past Monday a "important advance" driven by advanced techniques in bullet matching and genetic testing, said the Austin mayor at a press conference.

Genetic matches indicate Brashers, who was confirmed following his demise as a multiple murderer. Additional killings are likely to be attributed to him as DNA analyses continue to improve and widespread.

"The sole forensic clue recovered from the yogurt shop corresponds directly to him," said the top law enforcement officer.

The murders isn't closed yet, but this is a "huge leap", and Brashers is thought to be the lone killer, officials confirmed.

Closure for Loved Ones

Eliza's sister, Sonora Thomas, said that her mind was split following the tragedy occurred.

"One part of my consciousness has been screaming, 'What happened to my sister?', and the other part kept insisting, 'It will remain a mystery. I'll pass away without answers, and I have to be OK with that,'" she stated.

When she learned about this progress in the investigation, "both sides of my mind started melding," she said.

"I know now the events, and that relieves my suffering."

Wrongful Convictions Overturned

This development not only bring closure to the grieving families; it also completely clears two men, minors when arrested, who maintained they were pressured into confessing.

Springsteen, then 17 years old when the murders occurred, was given a death sentence, and Michael Scott, aged 15 at the time, was given life imprisonment. The two stated they admitted involvement after extended questioning in the year 1999. In 2009, both men were released after their guilty findings were reversed due to court rulings on admissions absent forensic proof.

The district attorney's office abandoned the case against the two men in that year after a genetic test, called Y-STR, indicated neither suspect corresponded against the DNA samples recovered from the crime scene.

Scientific Breakthrough

The Y-STR profile – suggesting an unidentified male – would in time be the crucial element in solving this case. In 2018, the DNA profile was reexamined because of scientific progress – but a national search to other police departments found no matches.

This past June, Daniel Jackson assigned to the case in 2022, had an idea. Time had gone by since the firearms evidence from the cartridge had been submitted to the National Integrated Ballistic Information Network – and in the years since, the database had undergone major upgrades.

"The software has advanced significantly. I mean, we're using advanced modeling now," Jackson stated at the media briefing.

There was a hit. An unsolved murder in Kentucky, with a comparable method, had the identical kind of shell casing. Investigators and a cold case expert spoke to the Kentucky detectives, who are still working on their open file – which involves processing samples from a sexual assault kit.

Linking Multiple Crimes

The apparent breakthrough got Jackson thinking. Was there any other evidence that might correspond to cases in other states? He considered right away of the Y-STR analysis – but there was a obstacle. The Codis database is the countrywide system for law enforcement, but the genetic material from the scene was insufficiently intact and scarce to submit.

"I said, well, several years have gone by. A growing number of laboratories are doing this. Registries are growing. We should conduct a countrywide check again," the detective explained.

He sent out the historic Y-STR results to investigative units around the country, asking them to manually compare it to their local systems.

There was another hit. The genetic signature aligned exactly with a genetic evidence from a city in South Carolina – a homicide from 1990 that was resolved with assistance from forensic experts and an expert in genetic genealogy in 2018.

Building a Family Tree

The genealogist created a genealogical chart for the murderer from that case and identified a family member whose DNA sample indicated a direct relationship – probably a sibling. A magistrate ordered that the deceased individual be exhumed, and his genetic material aligned against the evidence from the yogurt shop.

Typically, she is puts behind her closed investigations in order to concentrate on the following case.

"However I have {not been