WEST MIDDLESEX, Pa. - A Mercer County man was killed Sunday when his tractor trailer veered off Interstate 80 in Butler County.

Fifty-nine-year-old Victor Darling of West Middlesex lost control of his rig near the Emlenton exit.

The truck went down an embankment, jack knifed and collided with a fence and a tree.

Darling was pronounced dead at the scene.