The pedestrian was struck just after 3 a.m. PT on the Langley Bypass and 198th, police said.
Surrey RCMP Staff Sgt. Bob Pinkewicz says a blue semi bobtail, with silver on the back, was seen leaving the scene.
Police are now looking for the driver and the vehicle involved and investigators are trying to identify the victim.
As of 6 a.m. PT, the Langley Bypass was closed between the Fraser Highway and 192nd St.