Aug. 22 (UPI) -- In 1991, four teen girls were killed at a frozen yogurt shop in Texas. More than three decades later, a new docuseries explores the unsolved slayings and provides a look behind the scenes at the investigation.

The Yogurt Shop Murders, which premiered Aug. 3 on HBO Max and concludes Sunday, revisits the Dec. 6, 1991, deaths of shop employees Jennifer Harbison and Eliza Thomas, both 17, Jennifer's sister Sarah Harbison, 15, and a friend of the girls, 13-year-old Amy Ayers. Police found the four teens dead, each shot in the head and severely burned after a fire was set at the I Can't Believe It's Yogurt store where they had been together at closing time.

Nearly a year after the killings, investigators arrested two men from Mexico for the crime. Mexican officials, who had arrested the two men, said they confessed to the slayings.

Investigators later determined that details the suspects gave about the killings didn't match with what really happened, and the men later recanted their confessions.

Police reopened the investigation in 1997, seeking to take a fresh look at evidence.