India, June 1 -- More than 100 days after 84-year-old Nancy Guthrie vanished from her Tucson, Arizona home, investigators are now looking to bring in new tools to help find her as fresh details about how the case has been handled continue to raise serious questions.

At a CrimeCon panel in Las Vegas this weekend, Fox News Digital reporter Michael Ruiz revealed he had received new information just minutes before taking the stage. "I heard from a really good federal source that they are now discussing bringing in new tools to the investigation," Ruiz said, adding that the tools in question would be technology-related, according to Court TV. He did not provide any further concrete details.

It has now been four months since Nancy Guthrie was...