The road deputy, Kenneth Gravett, 42, was arrested by the FBI, McClendon said. He was a 17-year veteran of the sheriff's office.
The charges stem from a vehicle insurance claim, McClendon said.
McClendon said the investigation started with a telephone call to his office from the insurance company.
"I was contacted by the insurance company that something wasn't right with a claim he had filed. So I called the FBI, who investigated him," he said.
The sheriff said he was following protocol, which calls for him to contact an outside agency to investigate suspicious activity within his office.