TUCSON, Ariz. — Nine months after Nancy Guthrie vanished from her Arizona home, authorities say they are pursuing new forensic approaches in a case that has gripped the nation but has yet to produce a suspect.

The Pima County Sheriff's Department said Friday it continues to work with the Nancy Guthrie Task Force on DNA analysis in an effort to advance the case. The department said investigators traveled to Florida earlier this month to meet with lab scientists to explore what more could be done.

The agency reminded the public that no tip is too small, saying even the smallest piece of information could be critical.

Guthrie, the mother of NBC "Today" co-anchor Savannah Guthrie, has been missing since early February. The 84-year-old was........

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