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On December 6, 1991, Jennifer Harbison and her coworker Eliza Thomas, both 17, were finishing their shift at the frozen yogurt shop where they worked. Waiting for a lift were Jennifer’s younger sister, Sarah Harbison, aged 15, and Sarah’s friend, 13-year-old Amy Ayers.

Moments before 12 AM, a blaze at the business drew firefighters and police, who uncovered the tragedy: the four teenagers had been tied up, fatally attacked, and showed signs of sexual assault. The blaze destroyed most of the forensic clues, except for a cartridge that had fallen into a gutter and tiny traces of biological evidence, notably traces under Ayers’ fingernails.

The Case That Shook a City

These horrific killings profoundly shook the city of Austin and became one of the most notorious unsolved mysteries in the United States. Following decades of dead ends and mistaken arrests, the murders ultimately led to a federal law signed in the year 2022 that allows victims' families to petition dormant cases to be reopened.

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

A Major Breakthrough

Law enforcement officials disclosed on recently a "significant breakthrough" powered by new technology in firearms analysis and forensic science, announced the Austin mayor at a media event.

Genetic matches point to Robert Eugene Brashers, who was identified after his death as a multiple murderer. Additional killings could be attributed to him as forensic technology evolve further and broadly applied.

"The sole forensic clue recovered from that scene corresponds directly to him," explained the head of police.

The case hasn't reached conclusion, but this represents a "significant advance", and the individual is thought to be the lone killer, officials stated.

Healing Begins

Eliza's sister, Sonora Thomas, shared that her mind was split after her sister was murdered.

"One portion of my mind has been demanding, 'What happened to my sister?', and the other part kept repeating, 'It will remain a mystery. I'll go to my grave unaware, and I have to be OK with that,'" she recalled.

After discovering of this progress in the case, "those two parts of my brain began merging," she noted.

"Finally I comprehend what happened, and that does ease my anguish."

Mistaken Arrests Corrected

The breakthrough not only bring closure to the victims' families; it also definitively absolves two individuals, minors when arrested, who claimed they were coerced into admitting guilt.

Springsteen, a teenager at the time at the time of the killings, was sent to death row, and Scott, aged 15 at the time, was given life imprisonment. Each defendant asserted they only confessed after hours-long interrogations in the late 1990s. In 2009, the two were set free after their convictions were thrown out due to legal changes on confessions absent tangible proof.

The district attorney's office dropped the prosecution against the two men in 2009 after a genetic test, known as Y-STR, indicated neither individual aligned against the DNA samples found at the yogurt shop.

Scientific Breakthrough

This genetic marker – suggesting an unknown man – would ultimately be the decisive factor in cracking the investigation. In 2018, the profile was submitted for retesting because of technological advancements – but a nationwide inquiry to law enforcement agencies returned no genetic matches.

This past June, the lead detective handling the investigation in 2022, came up with a thought. It had been since the bullet casings from the cartridge had been submitted to the National Integrated Ballistic Information Network – and in that time, the registry had been significantly improved.

"The software has advanced significantly. In fact, we're using three-dimensional imaging now," the detective said at the media briefing.

The system identified a link. An unsolved murder in another state, with a comparable method, had the same type of cartridge. Jackson and another official met with the local investigators, who are still working on their unidentified investigation – and are analyzing evidence from a rape kit.

Connecting the Dots

The apparent breakthrough prompted further inquiry. Might there exist additional proof that might link with investigations elsewhere? He thought immediately of the Y-STR analysis – but there was a challenge. The Codis database is the national DNA database for police, but the yogurt shop DNA was not complete enough and minimal to upload.

"I said, well, several years have gone by. More labs are doing this. Registries are growing. I proposed a national inquiry again," Jackson stated.

He circulated the years-old genetic findings to law enforcement agencies around the country, requesting them to manually compare it to their local systems.

They found another match. The DNA pattern aligned exactly with a genetic evidence from Greenville, South Carolina – a homicide from 1990 that was closed with help from a genetic genealogy company and a well-known researcher in 2018.

Building a Family Tree

The genealogist created a ancestry profile for the murderer from that case and found a relative whose genetic material pointed to a immediate family link – probably a sibling. A judge authorized that Brasher's body be dug up, and his biological samples corresponded against the crime scene sample.

Usually, this expert is puts behind her resolved crimes in order to work on the following case.

"But I have {not been