A Harpswell man was killed in an early morning rollover on Mountain Road in Harpswell. Credit: Courtesy of the Cumberland County Sheriff's Office

A Harpswell man was killed in a Monday morning rollover.

Mason Warren, 21, was driving a 2002 Chevrolet Silverado on Mountain Road, near Reach Road, about 6:53 a.m. when he left the road on a dirt shoulder, returned onto the road, crossed the centerline and struck a large dirt embankment, according to Capt. Kerry Joyce of the Cumberland County Sheriff’s Office.

The truck then flipped onto its roof before coming to a rest, Joyce said.

Warren, who wasn’t wearing a seatbelt, died at the scene.

The crash remains under investigation, but speed and alcohol don’t appear to be factors.