Officers are appealing for information following the death of a 56-year-old man who was involved in a crash in the Mansfield area.
Police say that Ralph Weller, of Sutton-in-Ashfield, has died following a collision between a black Kawasaki Ninja motorcycle and a Honda Jazz car.
The incident happened on the A617 at the junction of Water Lane just before 8pm on Thursday 11 January.
Mr Weller and a 38-year-old woman are said to have been travelling on the motorcycle, and she remains in a critical condition at the Queen's Medical Centre. The driver of the car suffered minor injuries.
It's believed that some motorists who may have witnessed the collision stopped at the scene initially but drove off before the emergency services arrived.
Officers are now appealing for anybody who has any information in relation to this incident to contact them.
Police ask that both families are given privacy at this time.