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On a Friday in December 1991, Jennifer Harbison and Eliza Thomas, both seventeen years old, were finishing their shift at the yogurt store where they worked. Staying behind for a lift were Jennifer's sister, 15-year-old Sarah Harbison, and Sarah’s friend, Amy Ayers, who was 13.

Moments before 12 AM, a blaze at the store summoned first responders, who made a grim discovery: the young victims had been bound, murdered, and showed indicators of assault. The configration eliminated the bulk of physical proof, except for a bullet casing that had rolled into a drain and minute samples of DNA, notably evidence under Ayers’ fingernails.

The Murders That Rocked Austin

The frozen yogurt shop case traumatized the Texas capital and became one of the most notorious unsolved mysteries in America. After years of investigative roadblocks and wrongful convictions, the homicides ultimately helped prompt a federal law approved in 2022 that enables victims' families to petition cold cases to be reopened.

But the killings remained unsolved for almost thirty-four years – before this development.

Key Development

Police authorities announced on recently a "important advance" driven by modern methods in ballistics and genetic testing, announced the local leader at a press conference.

The evidence suggest Robert Eugene Brashers, who was named following his demise as a repeat offender. Further crimes are likely to be linked to him as genetic testing evolve further and more commonly used.

"The single piece of proof recovered from the crime scene has been matched to him," said the head of police.

This investigation isn't closed yet, but this marks a "major step", and the individual is believed to be the sole perpetrator, officials stated.

Families Find Answers

The sister of Eliza Thomas, Sonora, shared that her thoughts were divided after her sister was murdered.

"One half of my mind has been demanding, 'What took place to my sister?', and the remaining part kept insisting, 'I will never know. I'll go to my grave unaware, and I must accept that,'" she said.

When she learned of this progress in the investigation, "the conflicting thoughts of my brain started coming together," she explained.

"Finally I comprehend the events, and that relieves my suffering."

Wrongful Convictions Overturned

The news doesn't just bring closure to the grieving families; it also completely clears two suspects, minors when arrested, who claimed they were pressured into admitting guilt.

Robert Springsteen, who was 17 during the crime, was given a death sentence, and Michael Scott, who was 15, was sentenced to life. Both men asserted they only confessed following extended questioning in the late 1990s. In 2009, the two were set free after their convictions were thrown out due to legal changes on admissions without tangible proof.

The district attorney's office dropped the prosecution against the defendants in the same period after a forensic examination, called Y-STR, revealed neither man corresponded against the genetic material found at the murder site.

The Investigation Advances

This genetic marker – pointing to an mystery suspect – would in time be the key in cracking the investigation. In 2018, the profile was sent for reanalysis because of improved methods – but a nationwide inquiry to law enforcement agencies returned no genetic matches.

In June, Daniel Jackson handling the case in 2022, had an idea. It had been since the bullet casings from the spent round had been entered to the National Integrated Ballistic Information Network – and in the interim, the registry had undergone major upgrades.

"The technology has improved dramatically. In fact, we're using advanced modeling now," he said at the media briefing.

They got a match. An unresolved killing in another state, with a similar modus operandi, had the same type of bullet casing. The detective and a cold case expert spoke to the law enforcement there, who are continuing to investigate their open file – including testing materials from a forensic kit.

Building a Case

This development prompted further inquiry. Was there additional proof that might correspond to crimes in different locations? He thought immediately of the Y-STR analysis – but there was a obstacle. The Combined DNA Index System is the national DNA database for police, but the yogurt shop DNA was insufficiently intact and limited to enter.

"I suggested, well, several years have gone by. Additional facilities are conducting this analysis. Systems are expanding. Let's do a national inquiry again," he stated.

He circulated the years-old DNA data to police departments across the United States, asking them to check by hand it to their internal records.

A second connection emerged. The profile corresponded precisely with a genetic evidence from another state – a homicide from 1990 that was solved with assistance from a genetic genealogy company and a celebrated genealogist in recent years.

Genetic Genealogy Success

The expert created a family tree for the murderer from that case and identified a kinship connection whose genetic material suggested a immediate family link – almost certainly a sibling. A magistrate approved that the deceased individual be exhumed, and his DNA corresponded against the crime scene sample.

Typically, the genealogist is puts behind her resolved crimes in order to concentrate on the following case.

"But I have {not been