When four teenage girls were murdered in an Austin, Texas, yogurt shop in 1991, a heartbroken city was left searching for answers. No one imagined that more than 30 years later, the case would remain unsolved.

But now, thanks to new advances in DNA technology, there is renewed hope that a piece of evidence collected from the scene on the night of the crime will be key to solving the case once and for all. "48 Hours" correspondent Erin Moriarty reports in an encore of "The Yogurt Shop Murders," airing Saturday, Aug. 2 at 9/8c on CBS and streaming on Paramount+.

Inside the yogurt shop were the charred bodies of four teenage girls ranging from 13 to 17 years old. The victims, clockwise from top left: Amy Ayers, Eliza Thomas, Sarah Harbison and Jennifer Harbison. AP Images

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