Nancy Guthrie is missing over 100 days. Yet, no suspect was arrested.

But a former detective at Pima County Sheriff's claims the police have the name of the suspect.

The ex-officer name is Robbie Mayer.

He was known for being part of the team who investigated the infamous 'Prime Time Rapist' case in the 1980s.

Brian Larriva was the name of the criminal.

He terrorised Tucson's community with his burglary throughout 1983 to 1986.

Larriva even used to sexually assault the women inside the home he entered to loot.

When his home was surrounded by the cops, he shot himself in 1986.

Mayer now draws a parallel to the case of Nancy's disappearance. 

By doing this, the former officer suggests, the suspect's name may be buried under the mountain of information about just what happened with them during Larriva's case.

"We ended up with more than 4,000 leads," he recalled at the time of the 'Prime Time Rapist' case.

With the overload of information, Mayer says the name of the suspect slipped, despite having it in hand.

"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."

In Nancy's case, the ex-detective shares that the investigators have to separate the wheat from the chaff.

"I believe the suspect's names are in those 50,000."

He continues, "The question is if they can recognise it when they see it."

"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."

Nancy has been presumably abducted from her home near Tucson, Arizona, on Feb. 28.