Blood was found at the campsite where the 29-year-old was staying.
The remains were found in a wooded area of Wisconsin in 2017.
The 36-year-old had been missing since his vehicle was found crashed in a ditch.
The human remains were found by a walker on April 1.
Foul play is not suspected.
The sheriff's office has not officially identified the human remains.
Few details about the case have been made available.