A 31-year-old man was killed when the all-terrain vehicle he was operating crashed in Monroe County on Sunday.

The accident happened around 8 p.m. on Upper Ridge Drive in Chestnuthill Township.

Mark A. Parcell of Effort was traveling north on Upper Ridge Drive when, for unknown reasons, the ATV traveled off the right side of the road and hit a utility pole, police said.

Parcell died at the scene. He was not wearing a helmet, officials said.