Nancy Guthrie case: For nearly four months, the disappearance of Nancy Guthrie has left investigators and her family searching for answers with no arrest and no clear breakthrough. Now, a former Arizona detective believes the key to solving the case may already exist inside the thousands of tips investigators have collected.The case has continued to draw national attention, especially after new comments from retired Pima County Sheriff’s Department detective Robbie Mayer. Speaking with News 4 Tucson, Mayer suggested that the suspect’s identity may already be sitting somewhere within the mountain of information gathered by investigators.As the search for the 84-year-old continues, authorities say forensic work and digital analysis are still underway.Could The Key Evidence Already Exist?You Might Also Like:Robbie Mayer, a former detective with the Pima County Sheriff’s Department, compared the Nancy Guthrie investigation to one of the biggest cases of his career. Mayer helped solve the “Prime Time Rapist” case in Tucson during the 1980s after investigators worked through thousands of leads over several years, as per a report by SheKnows.Speaking with News 4 Tucson, Mayer explained how difficult it can be for investigators to identify the one important clue hidden among massive amounts of information.“One of the detectives had Larriva’s name as a lead, but he hadn’t gotten to it yet because he had so many leads in front of that,” Mayer recalled.Now, Mayer believes something similar may be happening in the Nancy Guthrie case, as per a report by SheKnows.You Might Also Like:“The suspect’s names are in those 50,000” tips generated in Savannah Guthrie’s mother’s case, he said.Mayer added that solving a case like this requires persistence from investigators. “The question is if they can recognize it when they see it,” he explained. “Being in a case like this is like being in a field with rocks, and what you’re looking for is under one rock. You just have to keep turning.”Why Does The Case Continue To Trouble Investigators?You Might Also Like:Nancy Guthrie was last seen on the evening of January 31 after her son-in-law, Tommaso Cioni, dropped her off at her Tucson home. When she failed to attend church services the following morning, she was reported missing.The disappearance quickly became a major national story, especially after Savannah Guthrie temporarily stepped away from the Today show to focus on helping search for her mother, as per a report by SheKnows.On May 12, the Pima County Sheriff’s Department shared an update as the investigation crossed the 100-day mark. Authorities said “scientific evidence processing and digital media analysis remain ongoing,” but confirmed that no suspect has been arrested.What Did Experts Say About Possible Motives?The mystery surrounding Nancy Guthrie’s disappearance gained even more attention following the NewsNation special, NewsNation Presents: The Nancy Guthrie Mystery.During the special, expert analyst Dr. Ann Burgess discussed the emotional impact surrounding the case and raised questions about who may be suffering most from the disappearance.“Well, first you want to always ask who’s suffering the most of this, who is hurt the most?” Burgess said. “And in this case, it doesn’t have to be the mother. It could be somebody in the family. Somebody — Savannah.”Even with national attention and thousands of tips, the case remains unsolved as investigators continue reviewing evidence and searching for answers in the disappearance of Nancy Guthrie.FAQsWho is investigating Nancy Guthrie’s disappearance?The Pima County Sheriff’s Department is leading the investigation in Tucson, Arizona.Has anyone been arrested in the case?No suspects have been arrested so far.