Today, co-anchor Savannah Guthrie's mother, Nancy Guthrie, remains missing four months following her abduction in Tucson, Arizona. A retired FBI agent has recently commented on reports that Savannah has engaged a private investigator.Savannah Guthrie's mother, Nancy, has been missing for four months after her abduction in Tucson. Savannah has reportedly spent $500,000 on a private investigator to aid the search. (REUTERS)According to an insider who spoke to The U.S. Sun, Savannah has invested approximately $500,000 on top of the official investigation, which has yet to identify any suspects.Nancy Guthrie update: Ex-FBI agent shares his perspective on private investigator's roleThe report has yet to receive official confirmation from Nancy’s family, the Pima County Sheriff’s Department, the FBI, or any other entity. However, Jason Pack, a former FBI special agent, shared his perspective on the potential involvement of a private investigator in the search for the 84-year-old.Also Read: Why is Ivanka Trump's post on Bettina Anderson and Don Jr.'s wedding trending? One subtle detail catches attention“I have nothing but respect for that decision,” Pack stated to Parade. “When it’s your mother, you exhaust every option available to you.”Furthermore, he emphasized, “A well-resourced investigator can pursue leads and conduct interviews in ways that complement what law enforcement is doing without getting in the way.”Pack wrapped up his reflections on the situation by suggesting, “Overall, I think, despite the undertones and rumblings, that’s not a complete lack of faith in the investigative team, per se. I see it more a daughter and a family doing everything in their power. Many families do the same thing.”Savannah's mother was last seen at her residence in Catalina Foothills on the night of January 31. In spite of Savannah presenting a $1 million reward and the FBI disseminating video footage and images of a masked individual on the 84-year-old’s doorstep, no suspect has been identified.Savannah's heartfelt post on Mother's DayMost recently, Savannah addressed her missing mother through an Instagram post on Mother’s Day.“Mother, daughter, sister, Nonie—we miss you with every breath. We will never stop looking for you. We will never be at peace until we find you,” she wrote. “We need help. Someone knows something that can make the difference. Call 1800CALLFBI. You can be anonymous and the reward remains available.”To conclude her plea for information, Savannah told her followers, “Please keep praying. Bring her home. 💛.”