A woman whose body was found in a car just after 3:30 p.m. Sunday had visited a business in the Fairfax Plaza shopping center at about 3 p.m. that day, police said.
Vanessa Pham, 19, appeared to be fine at the shopping center, police said.
Pham was found stabbed to death in a car in a ditch along Arlington Boulevard in Annandale after police received a report of a vehicle crash. But her injuries were inconsistent with the crash, and her death was ruled a homicide.
Pham had just finished her freshman year at Savannah College of Art.
Investigators went back to the crash scene Friday to search for evidence.
Anyone with information related to incident is asked to contact Crime Solvers at 1-866-411-8477 or through the website.