State police say a woman walking on Interstate 91 in Longmeadow has been struck and killed by a tractor-trailer.

The woman was struck in the southbound lanes at about 2:30 a.m. Tuesday.

No name was immediately released by police described the victim as a ``young female.'' She was pronounced dead at the scene.

The preliminary investigation suggests the woman, who was on foot when she was hit, may have been an occupant in a vehicle prior to the crash.