The 16-week investigation into Nancy Guthrie's disappearance continues without suspects. Authorities suspect the 84-year-old was abducted from her Arizona home. Experts suggest a shift in cybercriminal tactics, with some now employing physical violence. While the case has sophisticated elements, a former detective believes "street-level thugs" might be involved, contrasting with traditional "wrench attacks."

Lisa Miller, a retired Colorado detective, shared a possible theory of what might have happened to Nancy Guthrie as the search for the 84-year-old continues.

A former FBI agent has offered four probable explanations into what may have happened to Nancy Guthrie.