A former cop has said that Nancy Guthrie "likely died within the first 72 hours" of her disappearance.

Nancy, 84, disappeared from her home in Arizona on February 1. She was last seen at the property on the night of January 31. Authorities have said she was taken from her home against her will.

Michael Gould, a former Nassau County lieutenant and founder of the NYPD's canine unit, has looked into the Nancy Guthrie case. He previously said that thinks there was an "under 10%" chance that was still alive.

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He told The Mirror US that the case is most likely now a recovery mission rather than rescue and has given a rough timeline for when Nancy could have passed away.

"Sadly, my assessment is that Nancy likely died within the first 72 hours and will ultimately be recovered," Michael said.

"Recovery doesn't bring closure-it simply removes the uncertainty of not knowing where she is."

He added that Nancy will likely be found near her home.

"Historically, victims of abductions are frequently found in relatively close proximity, two to five miles. Nancy's body will likely be found within a few miles of her home."

Nancy's health has also been a focus. The mother of journalist Savannah Guthrie took daily medication and Michael that it could be fatal if Nancy were without her pills for more than 24 hours.

"It has now been nearly a month. Nancy was elderly, in poor health, and required life-sustaining medication."

Her family is offered a reward of up to $1 million for Nancy's recovery.

"The reward reflects the reality that investigators are likely running out of credible leads and that the family has, heartbreakingly, accepted that Nancy may be deceased," Michael said.