FLAGSTAFF, Ariz. (AP) — Richard Blodgett, a single father, was jailed on a drug charge when a worker from Arizona's child welfare agency delivered the news: His son was brain dead and on life support — just days after being taken into state custody.

Blodgett screamed, cried and screamed some more. Jakob was his only son, a "darn cute," curious 9-year-old who loved remote control cars and video games.

Blodgett is now struggling to understand how it happened.

A medical examiner listed Jakob's death in late December as natural with complications from diabetes, a condition he was diagnosed with as...