Share Tweet Pin Email By Isabella Torregiani 11:40am PST, Feb 23, 2026 _ Complications involving DNA evidence are creating new "challenges" in the search for Savannah Guthrie's missing mother, Nancy Guthrie, according to Pima County Sheriff Chris Nanos. Keep reading for more details on the investigation... MORE: Follow Wonderwall on MSN for more _ "Our lab tells us there's challenges with it," Chris Nanos said in a sit-down interview with NBC News correspondent Erin McLaughlin, explaining that the DNA found inside Nancy Guthrie's home is "mixed.