Eric Zentner, 30, has modeled for Versace and Louis Vuitton. He also appeared in Katy Perry's music video for "Hot N Cold."
Early Saturday, Zentner was on his way to visit his mother in the Sacramento area when he ran out of gas near Buellton.
The California Highway Patrol said he got out, started walking and was hit.
Authorities found pieces of plastic and light blue paint at the scene believed to belong to a light blue Dodge Caravan.
Zentner's family is asking the driver to come forward.