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During a Friday in December 1991, Jennifer Harbison and Eliza Thomas, both 17, were finishing their shift at the yogurt store where they were employed. Remaining for a ride home were Jennifer’s younger sister, Sarah Harbison, aged 15, and Sarah’s friend, 13-year-old Amy Ayers.

Shortly before the clock struck twelve, a inferno at the shop attracted first responders, who found a horrific scene: the four girls had been tied up, murdered, and showed evidence of sexual violence. The blaze eliminated the bulk of physical proof, with the exception of a shell casing that had fallen into a gutter and trace amounts of DNA, notably material beneath Amy Ayers' nails.

The Case That Shook a City

The frozen yogurt shop case profoundly shook the Texas capital and became one of the most infamous cold cases in America. After years of dead ends and wrongful convictions, the murders ultimately helped prompt national legislation approved in 2022 that enables families of the deceased to ask for dormant cases to be reopened.

But the crimes continued to baffle investigators for over three decades – before this development.

Significant Progress

Law enforcement officials disclosed on recently a "major development" driven by new technology in firearms analysis and genetic testing, said the Austin mayor at a news briefing.

Forensic clues suggest Brashers, who was identified after his death as a multiple murderer. Further crimes may be attributed to him as forensic technology become more advanced and more commonly used.

"The sole forensic clue found at the yogurt shop has been matched to him," explained the city's police chief.

The murders hasn't reached conclusion, but this is a "major step", and the individual is thought to be the sole perpetrator, authorities stated.

Healing Begins

A family member, Sonora, expressed that her thoughts were divided when the tragedy occurred.

"One half of my consciousness has been yelling, 'What happened to my sister?', and the remaining part kept saying, 'I will never know. I'll pass away without answers, and I have to be OK with that,'" she recalled.

Upon hearing about this progress in the case, "both sides of my mind started melding," she noted.

"Now I understand the events, and that relieves my anguish."

Mistaken Arrests Corrected

The news not simply bring peace to the victims' families; it also fully exonerates two suspects, teenagers at the time, who insisted they were forced into confessing.

Robert Springsteen, then 17 years old during the crime, was sent to death row, and Michael Scott, a 15-year-old then, was received a life sentence. Each defendant stated they only confessed after marathon interviews in the late 1990s. In 2009, they were set free after their guilty findings were reversed due to legal changes on admissions absent tangible proof.

Legal authorities withdrew the case against the two men in that year after a forensic examination, known as Y-STR, showed neither individual corresponded against the genetic material found at the murder site.

Scientific Breakthrough

The Y-STR profile – pointing to an unknown man – would eventually be the crucial element in cracking the investigation. In recent years, the DNA profile was sent for reanalysis because of technological advancements – but a countrywide check to law enforcement agencies found no matches.

In June, the lead detective handling the investigation in recently, considered a new approach. Time had gone by since the firearms evidence from the cartridge had been entered to the national ballistic system – and in the interim, the system had undergone major upgrades.

"The software has improved dramatically. In fact, we're talking like three-dimensional imaging now," he stated at the media briefing.

The system identified a link. An open homicide case in the state of Kentucky, with a comparable method, had the same type of cartridge. Investigators and a colleague spoke to the law enforcement there, who are still working on their unnamed case – and are processing samples from a forensic kit.

Linking Multiple Crimes

The apparent breakthrough got Jackson thinking. Might there exist additional proof that might link with cases in other states? He recalled instantly of the Y-STR analysis – but there was a challenge. The Combined DNA Index System is the countrywide system for police, but the yogurt shop DNA was insufficiently intact and limited to submit.

"I suggested, well, it's been a few years. A growing number of laboratories are doing this. Systems are expanding. We should conduct a national inquiry again," the detective said.

He sent out the years-old DNA data to investigative units nationwide, asking them to check by hand it to their local systems.

There was another hit. The DNA pattern corresponded precisely with a DNA sample from a city in South Carolina – a 1990 murder that was solved with the aid of forensic experts and a celebrated genealogist in recent years.

Building a Family Tree

The researcher created a genealogical chart for the murderer from that case and found a relative whose DNA sample indicated a direct relationship – almost certainly a close relative. A court official ordered that the deceased individual be dug up, and his genetic material matched against the evidence from the yogurt shop.

Normally, she is able to set aside closed investigations in order to work on the next one.

"However I have {not been