KELLNERSVILLE, Wis. (AP) — A 14-year-old Wisconsin boy is dead after the all-terrain vehicle he was riding apparently rolled on top of him and fractured his skull.

The Manitowoc County Coroner says Jefferson Haupt was not wearing a helmet when the accident happened Saturday at the family home near Kellnersville.

The teen was flown to Aurora Bay Care in Green Bay, but was pronounced dead shortly after arrival.

The Wisconsin Department of Natural Resources is investigating.