Authorities say a 47-year-old man has died while trying to push an all-terrain vehicle of the mud in Waterboro. The Maine Warden Service would only say that the victim experienced some kind of “medical event” while he two other men tried to push the ATV free at about 2 p.m. Monday. He died at the scene. His name was not immediately made public. Authorities say the man was operating a two-person ATV through a wooded area of town. The death remains under investigation.