Ashton Sachs was an honors student, a trading-card fanatic and the kind of kid who taught residents at his grandmother's nursing home how to use computers. Today, he is in solitary confinement as he awaits trial for the murders of his parents, Brad and Andra Sachs. The grisly crime - which Sachs, then 19, confessed to police less than one month after the February 2014 murders - has stunned the wealthy community of San Juan Capistrano, California, where Ashton shot his parents in their bed at the family's $2.5 million luxury home. Ashton's brother Landon, who was 8 at the time of the shootings,...