UPDATE: Remains in Sac City, IA home could be ex-homeowner - KTIV News 4 Sioux City IA: News, Weather and Sports

UPDATE: Remains in Sac City, IA home could be ex-homeowner

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© Officials believe the remains might be that of 58-year-old Mark Koster, who disappeared in 2009. © Officials believe the remains might be that of 58-year-old Mark Koster, who disappeared in 2009.

The owner of a Sac City, Iowa home discovered what looked like human remains in his basement, Monday. Police think it could be the home's previous owner.

Neighbors tell us Monday afternoon, Les Gehlsen, of Gehlsen Properties, was cleaning out the basement of his recently purchase home, 610 North 5th Street. That's when he found what looked like skeletal remains. Gehlsen called the police. 

"We arrived on scene and identified them as, most likely, human remains," said Sac City Police Chief John Thomsen.

Officials believe it might be 58-year-old Mark Koster, who disappeared in 2009.

Sandra Dierenfeld lived next door to Koster. She says the last communication she had with him was through a note on his door, saying he and his roommate were going on a trip.

"Yeah they were just gone. They left a note saying they were going to Florida, they'd see me in the spring, please take care of the property," she said. 

Dierenfeld says Koster was a smoker and in noticeably bad health. She thinks if the remains are his, Koster's death may have been a suicide.

"His accounts were never touched; everything was left intact in the house. I think it was what he wanted," said Dierenfeld.

Sac City Police say the remains have been sent to the Iowa State Medical Examiner's Office for autopsy. They say they're not ruling out the possibility of foul play.

"We don't know for sure. That's why we need to wait to get the results back and, hopefully identification. Then we'll go from there," said Chief Thomsen.

Sac City's police chief says autopsy results could come back in the next few days.

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