A key forensic development has intensified the search for Nancy Guthrie, mother of Savannah Guthrie, after DNA confirmed blood found outside her Tucson-area home belonged to her. Authorities say the investigation, now nearly two weeks in, includes FBI involvement, desert searches, and analysis of doorbell footage that produced a suspect description and a $100,000 reward offer. Experts reviewing the blood pattern suggest the injury was serious and inconsistent with a simple accident, while Savannah continues public appeals as officials pursue thousands of tips and work to clarify what happened.
