Overview
- This week, Mexican volunteer teams searched Mariposa near Nogales after an anonymous tip but reported no evidence tying any graves or remains to 84‑year‑old Nancy Guthrie.
- Pima County authorities confirmed they were aware of the tip report but said Mexican officials had not contacted them and that the case remains an active investigation.
- Investigators continue to focus on domestic forensic evidence gathered at Guthrie’s Tucson home, including surveillance footage of a masked person and blood found on the property.
- Officials say multi‑lab DNA and forensic workflows are lengthening timelines, and detectives are prioritizing careful testing to avoid missteps before any charges are brought.
- Volunteer groups note the Mariposa area has yielded more than two dozen unmarked graves in recent months, a factor that complicates attribution and makes cross‑border verification essential.