CHP officials responded to reports of a vehicle on the shoulder at Spring Street shortly before 3 a.m. Monday. Upon arrival, they found that a pedestrian was fatally struck.
The victim's gender and age were not immediately released.
Northbound lanes were shut down for about two hours, and traffic was diverted off at Katella Avenue.
All lanes were back open at about 5:30 a.m., according to CHP officials.