Nancy Guthrie kidnapping update: What surveillance footage reveals in the Nancy Guthrie kidnapping case — and how the investigation strategy has changed after three weeks

Eighty-four-year-old Nancy Guthrie has been missing for 21 days in Tucson. The FBI and Pima County Sheriff confirm a suspected kidnapping. Doorbell camera footage shows a masked man. Blood DNA matched Nancy. Her pacemaker signal dropped minutes later. The suspect is 5’9” to 5’10”, average build, facial hair. He may carry a backpack and handgun. Police now seek a Tucson man missing three weeks.