A photograph provided by the family of David Sal Silva, showing him with three of his children, Makayla, 10, Katelyn, 4, and Chelsey, 8 A California father of four died Wednesday shortly after a group of police beat him with batons as he lay defenseless on the sidewalk. Cops, before confiscating witness’ cameras, also reportedly unleashed a canine unit (police dog) on him. David Sal Silva, 33,...