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Back on the 6th of December, 1991, seventeen-year-old Jennifer Harbison and her coworker Eliza Thomas, both seventeen years old, were wrapping up at the frozen yogurt shop where they were employed. Staying behind for a ride home were Jennifer’s younger sister, Sarah Harbison, aged 15, and her friend, Amy Ayers, who was 13.

Just before midnight, a inferno at the store attracted firefighters and police, who made a grim discovery: the four teenagers had been restrained, killed, and showed indicators of assault. The fire eliminated nearly all evidence, except for a shell casing that had rolled into a drain and minute samples of DNA, among them evidence found in her nail scrapings.

The Case That Shook a City

These horrific killings traumatized the city of Austin and evolved into one of the best-known cold cases in the United States. Following decades of false leads and wrongful convictions, the killings in time contributed to a U.S. law enacted in the year 2022 that enables victims' families to ask for cold cases to be reinvestigated.

Yet the murders stayed unresolved for nearly 34 years – until now.

Key Development

Law enforcement officials disclosed on recently a "major development" powered by advanced techniques in bullet matching and DNA analysis, stated the city's mayor at a news briefing.

The evidence indicate Robert Brashers, who was identified following his demise as a repeat offender. More murders could be attributed to him as DNA analyses become more advanced and more commonly used.

"The only physical evidence found at the crime scene has been linked to him," explained the head of police.

The case remains open, but this marks a "major step", and the individual is believed to be the only attacker, authorities said.

Healing Begins

A family member, Sonora, expressed that her psyche was fractured when her sister was murdered.

"One half of my brain has been screaming, 'What took place to my sister?', and the remaining part kept saying, 'It will remain a mystery. I'll pass away without answers, and I have to be OK with that,'" she said.

When she learned about this breakthrough in the investigation, "both sides of my thinking started coming together," she noted.

"I know now what happened, and that lessens my anguish."

Innocent Men Exonerated

The news doesn't just bring peace to the loved ones; it also definitively absolves two men, teenagers at the time, who insisted they were forced into giving false statements.

Robert Springsteen, then 17 years old at the time of the killings, was sent to death row, and Michael Scott, aged 15 at the time, was received a life sentence. The two asserted they only confessed after hours-long interrogations in the year 1999. In the following decade, they were set free after their verdicts were thrown out due to new precedents on confessions without forensic proof.

Prosecutors dropped the charges against Springsteen and Scott in the same period after a DNA analysis, called Y-STR, showed neither individual corresponded against the DNA samples found at the crime scene.

Modern Technology Solves Case

The DNA signature – suggesting an unidentified male – would ultimately be the key in solving this case. In 2018, the DNA profile was submitted for retesting because of technological advancements – but a national search to law enforcement agencies found no matches.

During the summer, an investigator assigned to the case in 2022, had an idea. Several years had passed since the ballistics from the shell casing had been submitted to the NIBIN database – and in the interim, the registry had undergone major upgrades.

"The technology has improved dramatically. Actually, we're using advanced modeling now," he commented at the press conference.

The system identified a link. An unresolved killing in the state of Kentucky, with a comparable method, had the matching variety of cartridge. Investigators and another official met with the Kentucky detectives, who are still working on their open file – and are analyzing evidence from a rape kit.

Linking Multiple Crimes

The new lead got Jackson thinking. Was there further clues that might correspond to investigations elsewhere? He thought immediately of the Y-STR analysis – but there was a challenge. The Combined DNA Index System is the national DNA database for investigators, but the evidence from Austin was insufficiently intact and minimal to enter.

"I said, well, it's been a few years. More labs are doing this. Registries are growing. I proposed a national inquiry again," Jackson said.

He sent out the long-standing genetic findings to investigative units across the United States, requesting them to review individually it to their local systems.

A second connection emerged. The genetic signature aligned exactly with a sample from Greenville, South Carolina – a killing that occurred in 1990 that was resolved with the aid of forensic experts and a well-known researcher in 2018.

Building a Family Tree

The expert created a family tree for the offender and located a relative whose biological evidence suggested a immediate family link – almost certainly a close relative. A judge ordered that the suspect's remains be dug up, and his genetic material aligned against the evidence from the yogurt shop.

Normally, she is can move on from closed investigations in order to work on the new mystery.

"Yet I have {not been