Law enforcement experts analyze evidence from Nancy Guthrie surveillance video, identifying five crucial investigative leads in the Arizona missing woman case.

Authorities say they have received more than 4,000 tips since the release of doorbell camera footage showing "an armed individual" outside her home on the morning of her disappearance.

The FBI has released surveillance photos of a potential subject in the investigation into the disappearance of “TODAY” co-anchor Savannah Guthrie’s mother. NBC News' Tom Winter reports on the new details.

Guthrie, 84, is the mother of “Today” host Savannah Guthrie. She was last seen outside her home on Jan. 31. Officials suspect foul play, and both the FBI and Guthrie’s family have released multiple pleas to anyone who may have taken her.

More than a week after Today's Savannah Guthrie and her siblings reported mom Nancy Guthrie missing, police are investigating all angles while the journalist issues public pleas for her safe return.

Law enforcement returned to Annie Guthrie’s Arizona home to conduct an additional search one week after Nancy Guthrie’s disappearance

Nancy Guthrie's disappearance has garnered a lot of attention from online sleuths, these are the most popular theories about her abduction.

On February 6, 1996, 10-year-old Zachary Ramsay set off to Whittier Elementary School. He never made it there and has never been seen or heard from since.