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SAC CITY, Iowa | Police said Wednesday that indications are the human remains found in a Sac City basement Monday are those of the home’s previous owner. The man, Mark Koster, has been missing since 2009.

“All signs point to believe that it’s probably Mr. Koster, but you never know,” said Sac City police Chief John Thomsen. An autopsy is being performed. 

The remains were discovered in a home in the 600 block of North Fifth Street by the property’s new owner, who was remodeling the basement, police said.

Koster was last seen with a friend on July 4, 2009. He was 58.

Police plan to re-interview Koster’s family and friends. Many were interviewed multiple times while police were searching for him.

Police also searched the house in 2009. There was no reason to think Koster had met with foul play, Thomsen said.

“All signs showed that he left,” Thomsen said. Koster was declared legally dead by accidental or other violent means on Oct. 10, 2011.

Jane Koster, Mark Koster's sister, said the family doesn't know who was found in the house.

"Everyone, as we heard about it, feels stunned and sad," said Koster, of Des Moines.

Thomsen wouldn’t say if investigators think Koster was the victim of foul play.

“We are going over the whole investigation,” he said.

No one lived in the house after Koster disappeared. Family members sold the home in May.

The new owner did not immediately return calls seeking comment.

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