In 1991 in Austin, Texas four teenagers are murdered. Two girls are closing up the yogurt shop that they work at while younger sister and a friend wait for a ride home. Sometime during their final clean up, they are attacked. All of them are bound, shot in the head, and the shop is lit on fire. Investigators do everything they can think of to solve the crime. Eight years later four men are charged, two confess and are convicted. Later winning appeals. In order to bolster their case, DA goes back to collected DNA. It is then, that science proved they convicted the wrong men. Still the case goes cold until 2025, when it is finally solved. The murderer with a long history of such crimes, but he will never see the inside of a courtroom for these murders. Having committed suicide in 1999 during a police stand off. Still families now know, who truly was to blame. 

Sources: 

The Yogurt Shop Murders: HBO Max

https://www.austintexas.gov/news/significant-breakthrough-made-1991-i-cant-believe-its-yogurt-murders

https://www.cbsnews.com/news/suspect-identified-in-infamous-texas-yogurt-shop-murder-case-48-hours/

https://www.youtube.com/watch?v=fXZW5gHXj0

https://people.com/yogurt-shop-murders-victim-helped-identify-suspected-killer-11823320

https://abcnews.go.com/US/haunting-yogurt-shop-quadruple-killings-solved-3-decades/story?id=126035260