The sheriff leading the case explains why investigators released two ransom notes and says the search remains active.

Pima County Sheriff Chris Nanos released a statement Thursday marking six months since the disappearance of Nancy Guthrie from her Arizona home.

The Pima County Sheriff's Department could be facing legal action from a man they'd detained during the search for 84-year-old Nancy Guthrie.

The first note, sent one day after Nancy went missing, was addressed directly to Savannah Guthrie.