In 1991, Austin, Texas was absolutely rocked by the sexual assault and murders of four teenaged girls in a local yogurt shop, I Can't Believe It's Yogurt before the shop was set on fire. Despite many confessions, the case remains unsolved.

Sources:
Who Killed These Girls?
By Beverly Lowry

https://www.kxan.com/news/local/austin/30-years-later-infamous-austin-yogurt-shop-murders-remain-unsolved/

https://www.conchovalleyhomepage.com/news/texas-cold-cases-the-austin-yogurt-shop-killings/

https://www.aetv.com/real-crime/the-austin-yogurt-shop-murders-cold-case-revisiting-the-scene-of-the-crime-more-than-25-years-later

https://www.austinchronicle.com/news/2009-07-17/810487/

https://www.austinchronicle.com/news/2002-09-06/101777/

https://www.cbsnews.com/news/innocence-lost-the-yogurt-shop-murders-09-01-2010/