Enrique Lopez, 32, was waiting for a tow truck on the shoulder when he was hit by a pick-up truck. he died a short time later.
Police found the truck and took its driver Fernando Almaraz, 40, into custody.
A police report indicates he had a strong odor of alcohol, and slurred his speech.
He also failed field sobriety tests.
Almaraz is now charged with one count of aggravated DUI.