PALMER, MASS. (WHDH) - Authorities have launched an investigation after a pedestrian was struck and killed by a tractor-trailer on the Massachusetts Turnpike over the weekend.

Troopers responding to a report of a crash involving a pedestrian on the eastbound side of the highway in Palmer around 3:30 a.m. Sunday learned a young man had been walking between the center and left travel lanes prior to being struck by the tractor-trailer, according to Massachusetts State Police.

The victim, whose name has not been released, was pronounced dead at the scene.

The tractor-trailer driver pulled over in the breakdown lane and immediately called 911.

State police say a preliminary investigation suggests the victim walked up onto the highway after parking his car on Route 181.

There were no additional details immediately available.

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