Madeleine McCann Suspect Could Be Identified

Authorities may have found huge clue in the disappearance of a 3-year-old girl.
3:00 | 03/22/14

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Transcript for Madeleine McCann Suspect Could Be Identified
We'll get into that brewing controversy coming up. We begin with what may be a huge clue in one of the most famous missing child cases in the word. Yes, authorities are naming a possible suspect in the abduction of 3-year-old Madeleine Mccann. The british girl who went missing from a resort in Portugal where her family was on vacation. ABC's terry Moran is in London with the latest. Good morning. Reporter: Good morning, Dan and bianna and you're right, after seven long years there may now be a faint glimmer of hope in the disappearance of little Madeleine Mccann. There are fresh clues along what is a trail of what may have been shockingly missed opportunities. She was 3 years old, asleep in her bed while her parents dined just 150 feet away. The family enjoying a vacation in Portugal and then she vanished into the night. A worldwide sensation then the trail went cold. That was in may 2007 and this week after all these years a possible suspect and an announcement from Scotland yard. Here we have a man who has a very, very disturbing and unhealthy interest in young white female children. Who he is attacking while they're on their holiday in their beds. Reporter: Britishq%ñ investigators are finally learning the full details about a series of child sexual assaults that took place in the years right before and after Maddie disappeared. In the same area of Portugal at resorts within 30 miles of each other. A man breaking into buildings on 12 separate occasions and he sexually assaulted five other young white british girls. Portuguese police facing harsh criticism for their handling of the case say they have long known of these attacks and had a suspect. Euclides Monteiro, a former waiter at the resort where the mccanns were staying. But they said they had insufficient evidence to charge him and he died in 2009. But Scotland yard isn't convinced Monteiro is the culprit here. And Maddie's mother says she will never give up her search for answers. How much heartbreak we put ourselves through so long as we get the result we need. This case has become a mission for investigators at Scotland yard. One saying this week that even if there's just a 0.1% chance that Maddie might still be out there they will pursue every lead doggedly until the end. Dan and bianna. Got to be a source of some comfort for the parents but they have been through hell. Terry, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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