A masked intruder appeared on the front steps of an 84-year-old woman's home, as seen in recovered doorbell camera video. The woman, Nancy Guthrie, was taken from her home in the early hours of February 1. She is the mother of "Today" co-host Savannah Guthrie.

Ransom notes related to the incident contain repeated writing quirks, according to an expert. These quirks could potentially help identify a suspect.

Further details about the incident and investigation are available from the source. Authorities are likely continuing to analyze evidence, including the doorbell camera video and ransom notes, to gather more information about the case.