The crash happened around 8 p.m. on November 4 on Fries Mill Road, just south of the intersection with Hurffville-CrossKeys Road.
Police say 58-year-old John DeMarco was struck and killed while walking on the roadway.
On Friday, authorities released photos of a vehicle. Investigators believe the driver has valuable information related to the deadly crash.
The vehicle was observed traveling in Washington Township on Town Center Blvd, Hurffville-Cross Keys Road and Fries Mill Road between 8 p.m. and 8:05 p.m.
Anyone with information is asked to call Washington Township Detective Matthew Laudenslager 856-589-0330.