Carmela Camacho, 50, Abel Valdez, 33, Yovanny Felix, 10, and Emmanuel Rivas, 11, killed in pedestrian collision on San Pasqual Valley Road in Escondido, California

Investigators were still trying to determine late Tuesday how fast the woman was driving the car, and where the pedestrians were in the roadway when they were hit, Walters said.

The investigation is ongoing. Anyone who witnessed the crash is being urged to contact Escondido Police at 760-839-4407.

The mother of the children and daughter to Camacho, Norma Espinoza, said the family takes the same walk nearly every evening, but this time they never made it home.