Information about Nancy Guthrie's pacemaker helped authorities piece together a new timeline in her kidnapping. Can the devices track you?

The authorities in Arizona have said they are investigating the disappearance of Nancy Guthrie, the mother of the “Today” show anchor Savannah Guthrie, as a possible kidnapping and are examining purpo...

Her daughter, co-anchor of NBC's morning news show "Today" since 2012, posted an online video on Wednesday tearfully pleading for her mother's safe return and appealing to the presumed abductors to op...