BOXBORO (CBS) – A car crash on Route 495 South left one person dead early Tuesday morning.

Phong Le, 41, of Melrose, was thrown from his Mercedes Benz after it veered to the left and struck a guardrail. He was pronounced dead at the scene.

It is unclear what caused Le’s car to go off the road. No other cars were involved.

The left and middle travel lanes were closed for about three-and-a-half hours as police investigated. They were reopened at about 5 a.m.