State Police say the truck was swerving along I-70. 
Hagerstown, Md (KM) Maryland State Police continue to investigate a fatal crash in Washington County Thursday morning along eastbound Interstate 70 near I-81 near Hagerstown. .
Troopers say a Mack Truck Tractor pulling two trailers began to swerve back and forth along the highway. The vehicle struck a guardrail and overturned off of the right shoulder. The operator identified as Raymond Davenport, 64, of Fairfield, Pennsylvania was pronounced dead at the scene.
The roadway was closed while State Police conducted their investigation.
By Kevin McManus