Lincolnshire Police have issued a fresh appeal for information following a fatal crash on the A16 between Sibsey and Stickney on April 4.
Seventy-four year old Boston man Richard Harrison was killed in the crash, which occurred as he was driving home from work.
His red Ford Focus collided with a Spanish registered Renault lorry at 12.50pm.
Police have now appealed for a key witness to step forward.
“We would particularly like to trace a silver estate car that was travelling towards Boston at the time of the incident,” said a spokesperson. “The vehicle is not involved in any way but it is thought that the driver may be an important witness to what happened.
“If you were the driver of that car, or if you have any information at all about the collision, please call the Collision Witness Hotline on 01522 558855,” they added.