LAGUNA NIGUEL, Calif.—On the last day of August, beneath a cloudless azure sky, countless photos of young people lined the chain-link fence at Laguna Niguel Skate Park, stretching off toward the horizon.
Costa Mesa resident Julie May, 66, stood nearby, pointing to photos of her daughter, Jessica Marie. In one picture, Jessica, a young woman with striking green eyes and platinum blond hair, holds a small child, her niece.





