(CNN)Investigators looking for two missing Wisconsin farmers found human remains Tuesday on the Missouri farm they've been searching.Two brothers drove to a man's farm for a business deal. They disappeared and he's in custody "Investigators are still working with Frontier Forensic doctors to determine what took place," Fish said. The sheriff declined to give any further information. Nelson has been the subject of previous investigations, including a federal one, Fish said. In 2015, when Nelson was 21 years old, he pleaded guilty to a cattle fraud scheme that resulted in losses of nearly $300,000 for the victims, according to a news release from the US Attorney's Office in the Western District of Missouri. Nelson's three-part fraud scheme included loan fraud, livestock sales and insurance fraud, the attorney's office said. A year later, Nelson was sentenced to two years in federal prison without parole and ordered to pay $262,450 to the victims.
CNN's Christina Maxouris contributed to this report.