ELCHO, WI (WTAQ) - Authorities in north central Wisconsin say they’re puzzled by Saturday’s death of a snowmobiler.

Langlade County chief deputy John Schunke tells the Antigo Daily Journal there was no evidence of a crash.

He said 55-year-old Robert Ottman of Rhinelander was alive when his machine reached the end of a private stretch of land next to Otter Lake near Elcho.

Ottman was reportedly planning to ride on the lake.

Langlade County Coroner Larry Shadick said Ottman could have died from exposure, but other factors remained possible before an autopsy was conducted Monday.

Ottman’s body was found next to his machine. Authorities have not been able to find his helmet. There’s no evidence of foul play.