Frida Litvak killed, Andrew Lawendowski slightly injured after two cars crash trying to avoid mattress on Route 128.

State police are looking for a dump truck wanted in connection with a fatal crash on Route 128 south in Burlington Tuesday afternoon.

Investigators believe two men were in the truck when a mattress flew off the back of it and landed on the highway.

The truck did not stop, but two vehicles, a Toyota Corolla and a Toyota Tundra, collided.

The driver of the Corolla, identified Wednesday as 56-year-old Frida Litvak of Framingham, was rushed to Lahey Clinic where she died.

The Tundra driver, Andrew Lawendowski, 43, of Charlton, suffered minor injuries in the accident.

State police say both drivers were wearing seat belts at the time of the collision.

A State Police Sgt. believes the dump truck driver was at least aware that the mattress flew off the truck.

“We have witnesses who saw them stop about a mile south of the accident re-securing their load and then they continued to drive on 95 southbound,” police said. “They had to (know) because they stopped to re-secure the load.”

The large dump truck had a white cab and possibly black netting or a tarp partially covering the bed.

The bed is reported to be dark with wood along the sides.

“At the time of the crash, it was reported to be occupied by two males and carrying multiple additional mattresses,” State Police said in a statement Wednesday.