The DNR says an Illinois man suffered a heart attack prior to a snowmobile crash Thursday night in Oconto County.
According to the Milwaukee Journal Sentinel, the victim was a 62-year-old man from Illinois.
The crash happened just before midnight on the Nicolet State Trail, south of the intersection of Highway 32 and county Highway W in Mountain.
The victim lost control after crossing state Highway 32, the snowmobile rolled over and pinned the man underneath.
Due to the nature of the crash, it will not be included in the state's records of snowmobile fatalities.