(FIRTH, ID) – A local woman was killed in an ATV accident near West Yellowstone Tuesday. Authorities say the 84-year-old victim was from Firth, though her name has not been released. They believe the woman was traveling downhill on a gravel road when she lost control of her ATV, eventually rolling it on top of her. She was not wearing a helmet and was pronounced dead at the scene. The accident remains under investigation.