A missing person’s case involving brothers from Shawano County has now turned into a death investigation. Nick and Justin Diemel are owners of a livestock business near Seymour. Authorities say the two drove to Braymer, Missouri, to see a customer nine days ago. A probable cause statement against a suspect in the case says the Diemels arrived at the client’s farm July 21st. Two hours later their truck leaves the property. Two hours later the truck is found running in a commuter lot along Interstate 35. The suspect allegedly admitted leaving the truck there. Clinton County Sheriff Larry Fish says investigators are searching the sprawling farm for any sign of the brothers, who are presumed dead.