UPDATE: Police name motorcyclist killed in crash with car on A47 Thorney Bypass
Henry Jarman, 90, of Millfield Road, Deeping St James suffered fatal injuries in a collision with a car on the east-bound section of the dual carriageway.
Officers were called to the accident, which happened on a straight section of road at Old Knarr Fen Drove, east of Thorney, at 12.26pm on Saturday.
Magpas Helimedics air ambulance said one of its volunteer doctors and a paramedic attended the scene, along with road ambulances and fire crews.
A Magpas spokeswoman said: 'Sadly the driver of the motorbike died at the scene. Our thoughts are with his family at this very difficult time.'
The driver of the car is understood to have suffered minor injuries in the collision.