<p>The envelope arrived from Santa Clara County’s Office of the District Attorney. With 28 years of anticipation and dread,  Joshua Klaver’s mother  slipped out the letter and braced herself. Would she finally get resolution — or would the system fail Josh again?</p>

A sheriff's deputy. His 10-year-old son. A bitter custody battle. A haunting death. Was it suicide? Or something more sinister? Twenty-five years later, authorities decided to take a closer look. So did Mercury News reporter Julia Prodis Sulek. Join her on a whirlwind journey from Silicon Valley to Oklahoma's cowboy country as she explores a brutal question: How did a 10-year-old boy end up hanging on the family farm?