Detective Cory Brown told NBC News that he could not tell from the remains that he saw whether the victim is male or female. The sex of the victim will be determined at autopsy.
The renter who was burying her cat is not a suspect, Brown told the network.
"She was a little bit shaken up," Brown said. "This is not what she expected to see."
The owner of the home is also not a suspect in the case, Brown said. Detectives are poring through the records of several renters who lived in the home over the past few years.
Families are also coming forward with the identities of missing loved ones with ties to the area, NBC News reported. Brown said one of those missing people, who he did not identify, vanished about five years ago and was living near the crime scene at that time.