Officers were called to the M23, between junction 8 and 9 shortly after 1am following reports of an individual on the carriageway.
The pedestrian, a woman, sadly died at the scene. Her family have been informed and are receiving support.
The motorway remained temporarily closed but was reopened at around 6am this morning.
Police are appealing to anyone who may have been passing through the area at the time or have dashcam footage to contact us.
If you have any information which could help, please direct message us or report online using webchat or our webform https:///www.surrey.police.uk/…/tell-us-about…/on our website, quoting incident/crime reference number PR/45220027562
If you do not wish to leave your name, please call the independent charity Crimestoppers on 0800 555 111.