TUCSON, Ariz. — A former FBI agent has highlighted what she called a "strange" detail in the ongoing investigation into the disappearance of Nancy Guthrie, noting that the family lacked access to security cameras around the 84-year-old's home that were installed primarily for wildlife observation.

Maureen O'Connell, a retired FBI agent, discussed the case in an interview with NewsNation, pointing out that first responders were informed early on that the family had no control over the cameras. The doorbell camera footage has become one of the few pieces of visual evidence, showing a masked individual attempting to disable it on the night of Feb. 1.

"The thing I found very, very interesting was that the family let the first responders know – this is based on the dispatch recordings – that they had no access or control over any of the cameras around that house," O'Connell said.

She added that the cameras appeared to be set up mainly for observing wildlife. "I guess the general understanding is that Nancy only put the cameras up for wildlife purposes – which I understand. I mean, I think it's great in a situation like that. It's cool to watch the birds and everything like that," O'Connell continued. "I just found that strange."

The comments come more than four months after Guthrie vanished from her Tucson-area home. Authorities have shifted the investigation to a "no-body" murder probe based on forensic evidence........

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