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ST. CHARLES COUNTY, Mo. – Authorities in O’Fallon, Missouri believe they’ve located the remains of a 39-year-old woman who went missing in December.

On Friday, O’Fallon police and the Community Emergency Response Team (CERT) conducted a ground search of the area east of Highway K and Technology Drive. They discovered human remains in an overgrown ravine in a thick underbrush by a creek, just east of a local hotel.

Those remains are believed to be that of Kelly Steiniger. She had not been heard from since December 6.

Back when Steiniger disappeared, her family posted flyers around town hoping they would help with finding Steiniger and bring her home safe. According toSteiniger’s mother, it was very unlike for her daughter to suddenly not be in communication.

The area had previously been searched by both air and foot patrols. Police said the case has been a long and very difficult investigation.

“We have been investigating this case for two months and followed over 40 investigative leads,” said Sergeant Robert Kendall.

“This was our fourth search and our third ground search. We searched a month ago with a helicopter with the help of Metro Air support and couldn’t locate her. And I will tell you, I was at the scene and it was very hard to locate her where she was at and it was very heavily wooded and very thick underbrush.”

Investigators do not suspect foul play in Steiniger’s death. The St. Charles County Medical Examiner’s Office has scheduled an autopsy for Saturday.