Lincolnshire Police are appealing for information following a three vehicle crash on the A159 at Scotter.
Police were called to the collision at around 1.50pm on Saturday, April 20.
It involved a white Citroen Berlingo, a black Ford Kuga and a grey Vauxhall Insignia.
The driver of the Berlingo, a man in his 40s, was pronounced dead at the scene.
The passenger in the Berlingo, a male teenager, was taken to hospital in Scunthorpe with injuries not thought to be life-threatening.
The driver of the Insignia suffered injuries which were also not thought to be life-threatening, and was taken to hospital in Hull.
The road was closed for several hours following the collision. It was re-opened fully around 7.30pm last night.
Anyone who witnessed the crash, or has dashcam footage, should call 101 quoting Incident 195 of April 20.