CHELMSFORD, MASS. (WHDH) - A New Hampshire man was killed Sunday when the car he was driving veered off Route 3 in Chelmsford and plunged into a body of water, officials said.

State troopers responding to a reported single-vehicle accident on Route 3 Southbound near Exit 3 around 5:04 p.m. found a 2011 BMW X3 that had exited the right side of the roadway and crashed into a body of water, according to state police.

After an off-duty trooper entered the water in an attempt to render medical aid to the driver, identified as 63-year-old Kenneth A. Rossi of Bristol, New Hampshire man, he was taken by ambulance to Lowell General Hospital, where he was pronounced dead.

A preliminary investigation suggests Rossi may have suffered a medical incident prior to the crash.

The incident is being investigated by the State Police Crime Scene Services Section and the State Police Collision Analysis Reconstruction Section.

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