Florecio Melendrez, 51, of Huntington Park, stopped on the shoulder of Interstate 805 just south of Sweetwater Road about 6 a.m. to help the driver of a car, which had overturned in the far left lane, authorities said. While crossing the freeway, he was struck by a car, according to Clopine.
Melendrez was taken by Life Flight helicopter to UC San Diego Medical Center, where he died at 1 p.m.
Witnesses said a black, older-model car sped from the scene after striking Melendrez. Anyone with information is asked to call the California Highway Patrol.