4-Year-Old Son of Fallen Officer Gets Police Escort on First Day of School

California police officers stepped in to walk a 4-year-old boy to school after his father was killed in the line of duty. It was little Greggorio Casillas' first day of transitional kindergarten, about five months after his dad, Pomona Police Officer Greggory Casillas, was shot and killed by a man who had barricaded himself in an apartment. InsideEdition.com's Mara Montalbano (https://twitter.com/MaraMontalbano) has more.