A Vassalboro man died Friday night after the ATV he was operating rolled on top of him, according to the Maine Warden Service.

Cobey Schmidt, 52, was operating a side-by-side style ATV in his yard at approximately 8 p.m. when the left front tire struck a rock, causing him to partially eject from the vehicle. The ATV then rolled on top of him.

A passing motorist noticed the ATV on its side with its lights pointing at the road and called 911. Maine State Police and emergency medical services arrived and lifted the ATV off Schmidt, who was pronounced dead at the scene.

Speed is suspected to be a factor in the crash, according to the Warden Service.

Maine State Police and Vassalboro Fire and Rescue assisted at the scene.