State police are trying to determine why a man was walking on the Massachusetts Turnpike in Natick before he was struck and killed by a tractor trailer.
The accident happened shortly after 3 a.m. Tuesday in the westbound lanes of the highway.
The pedestrian has been identified as 40-year-old Ramuel Raagas, of Framingham. He was pronounced dead at the scene.
The tractor trailer was owned by Bozzutos Inc. of Cheshire, Connecticut. State police say the trucking company and the driver, a Waterbury, Connecticut man, are cooperating fully with the investigation.
The right lane and breakdown lane of the highway were closed for more than two hours after the accident.