Major Crash Investigators are seeking information about a fatal crash in High Wycombe earlier this year.
On March 31, a 26-year-old woman was struck by a white Mitsubishi station wagon travelling north on Roe Highway near the Maida Vale Road overpass.
It is believed the woman stepped out of her vehicle before the fatal blow.
Police would like to speak to anyone who saw a man and a woman standing next to a white 2004 Subaru Impreza sedan at the time of the incident.
They would also like to speak to a group of people who were standing on the Maida Vale overpass, as well as those inside a light coloured sedan that pulled up near the Subaru.
Anyone with information is asked to contact Crime Stoppers.