A West Gardiner man was killed Friday when the dump truck he was operating overturned off Doyle Road in Whitefield, police said.

The driver was identified as Robert Frith, 62, an employee of BHS Inc. in Farmingdale, Stephen McCausland, spokesman for the Maine Department of Public Safety, said Friday evening.

Troopers said the truck, which was loaded with gravel, went off the road, overturned on its side and struck a tree.

Frith was pronounced dead at the scene.

McCausland said the cause of the crash was still under investigation.