AUSTIN, Ind.-- Police in Scott County, Ind. have launched an investigation after they found a body behind a home in Austin.

The body, which investigators said they believe to be that of Paul Graupe who went missing in 2009, was discovered at a house on W. Main Street.

Sheriff's deputies said they received a credible tip Tuesday, the anniversary of Graupe's disappearance, that led them to the body.

Robert Riley Sr. is the owner of the property and police said they questioned him when Graupe when missing. Riley's son, Robery Riley Jr., also lives at the home and was arrested on unrelated charges.

Police said they believe Riley Sr. was the last person to see Graupe.

More charges are expected to be filed as the investigation wraps up.

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