Nancy Guthrie was alive when abducted, blood evidence shows 'last stand' on front porch: retired FBI agent

Nancy Guthrie, the 84-year-old mother of Savannah Guthrie, was abducted from her home in Tucson, Arizona, and blood evidence suggests she was alive when taken. A retired FBI agent believes the suspect made mistakes that will lead to their capture. The FBI has recovered imagery from a Nest doorbell camera showing a masked man arriving at Guthrie's home.