Police are appealing for witnesses following a fatal collision on the A413 Amersham Road in Gerrards Cross.
The incident happened on Sunday morning (29 August) at about 8.50 on the southbound carriageway.
A silver Mercedes was involved in a collision with a bicycle. Sadly, the rider of the bicycle, a 78-year-old man was killed.
Investigating officer, PC Mellissa Wells, of the Serious Collision Investigation Unit, said: “This was a tragic incident which has resulted in the death of a 78-year-old man.
“I am appealing for anyone with any information or dash-cam footage which could relate to this to get in touch with us by calling the Thames Valley Police non-emergency number on 101, quoting reference number 43210387747.”
No arrests have been made.