Former Stanford preschool teacher arrested in San Jose man's murder

In the quiet corridors of a university campus, where the work of nurturing young lives unfolds daily, authorities made an arrest that reminds us how sharply private tragedy can intrude upon public trust. Diana Ornelas, a 22-year-old preschool teacher at Stanford's Children's Center, and Dennis Novoa, 27, were taken into custody Wednesday in connection with the April shooting death of Oliver Waterfall, 24, whose body was found down a hillside in Santa Cruz County. The case, believed to be rooted in personal conflict among people who knew one another, now moves toward the formal machinery of jus