Lincolnshire Police officers investigating a fatal crash on the A52 are appealing for more witnesses to come forward.
A white Suzuki motorbike and a black Ford Galaxy crashed near to the Haceby junction at around 5.30pm on Monday, August 28.
Police have since confirmed that a man died from his injuries.
A woman in her 40s is currently in hospital receiving treatment.
The driver of the Ford Galaxy, a man in his 30s, was arrested on suspicion of leaving the scene of the crash.
A police spokesperson said: “Collision investigators are keen to speak to the occupants of a light coloured modern styled Nissan Micra that was travelling west on the A52 on Bank Holiday at approximately 5.50pm.
“They were travelling in a convoy of traffic near the village of Dembleby (between Osbournby roundabout and Grantham).
“Although not involved in the collision in any way, we believe that the occupants of this car may have witnessed the serious collision between a motorcar and a motorcycle and could hold crucial information to assist with ongoing enquiries.
“If you have any information that would assist please call Lincolnshire Police on 101 and refer to incident 406 of August 28.”