Officers are renewing their appeal for those who witnessed a fatal collision on the M69 to come forward.
The collision happened at around 9.30am on Saturday 7 September between junction 2 of the M69 and junction 21 of the M1 and involved a car and a motorbike.
The motorcyclist – who was riding a white BMW S1000 – was pronounced dead at the scene.
The driver of the car, a white Audi A3, was not injured.
DC Charlotte Wright is the officer in the case. She said: “I want to hear from people who were on that stretch of road around the time of the collision.
“If you haven’t already spoken to us, I urge you to contact us. I know it was a couple of weeks ago now, but any information you have might help.“Did you see either of the vehicles prior to the collision? Help us continue to piece together what’s happened.”
Call 101 quoting incident number 169 of 7 September.