Texas police have made a surprising discovery: the remains of a 15-year-old girl who has been missing for a quarter of a century, or so they think.

The girl would be about 40 years old today, and her possible remains have been discovered thanks to the fact that the family of a suspect in her death have tipped police, according to a Fox News report.

Deputies in Wharton County went to a property owned by the suspect’s family in a nearby county, where they found what they think are the remains of Rosemary Diaz, who disappeared in 1990 from a general store not far from the property where the remains were found.

Police found a ring at the site that looks like the one she was given, and forensic tests will be conducted to make the ruling final.

Diaz had called her mother on that fateful day to let her know she was locking up and would be home soon. A couple who reportedly came on the scene later said they saw the store unattended and her car still in the parking lot. The television behind the counter was also still on.

However, the store didn’t have security cameras and it became a big mystery, so much so that it was even featured on “America’s Most Wanted.”

The suspect in this case died months ago and his identity has not yet been released. He was likely in his 20s at the time. He is believed to have no connection to Diaz, and it was likely a crime of opportunity.