State police say a New Gloucester man has died after the all-terrain vehicle he was operating struck a tree. Police say 32-year-old Brock Thompson pulled out of a dirt driveway and onto the road at about 3:30 p.m. Sunday when he lost control and hit the tree. A neighbor heard the crash and called 911. Trooper Jodell Wilkerson says Thompson was not wearing a helmet and sustained major head injuries. The crash remains under investigation.