Texas authorities appear to be on the cusp of cracking a cold case involving the disappearance of an 18-year-old woman, the Lubbock Avalanche-Journal reports.

Zoe Campos went missing in 2013 in Lubbock, Texas, and has not been seen or heard from since.

On Saturday, police announced they had charged 25-year-old Carlos Andrew Rodriguez with her murder and had located human remains buried in a South Lubbock backyard that could be Campos’.

While investigators are still working to excavate the site and recover and identify the skeletal remains, authorities were confident enough to charge Rodriguez.

As these developments were unfolding, Rodriguez was already in jail waiting to serve a 4-year prison sentence for stalking in a separate case. He had been a person of interest in Campos’ disappearance but police did not have sufficient evidence at the time to prosecute him, Lubbock Police Chief Greg Stevens told the newspaper.

Rodriguez remains in the Lubbock County Detention Center on a $500,000 bond.

The human remains were reportedly found in the backyard of a rental home occupied by people who were not living there when Campos went missing. The current tenants are cooperating with police, Stevens reportedly said.

Campos’ mother, Melinda, reported her daughter missing on Nov. 19, 2013. She had been last seen two days earlier having dinner at the Copper Caboose restaurant. Zoe returned to her apartment and later sent a text message around 1:30 a.m. the following morning from a park, according to KCBD-TV.

Stevens said new detectives were assigned to the case to examine it again, using both old and new information.

Police are expected to release more details on Monday or Tuesday.

“I’m not sure that even if I sat down and put a pen to it, I could show you all the man-power involved in this one investigation, because of how long it’s gone on,” Stevens said. “But suffice it to say, we don’t give up, the police don’t quit and don’t give up until we find a resolution.”

[Feature image: Zoe Campos/Facebook]