Kate and Gerry McCann have campaigned throughout the last 10 years to find any information about the disappearance of their daughter, Madeleine, in 2007.
But they now face further stresses and scrutiny as a Portuguese crime expert, Moita Flores, has made a bold claim about the then three-year-old's disappearance.
Flores, once involved with the Portuguese police, has claimed: "Maddie died in that apartment, I have no doubt."
Credit: PA
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Flores has had a strong lash-out at the McCanns, telling a Portuguese website: "Why this child when there are so many others who have disappeared?"
He's assessed evidence and believes "...it would have been impossible to get through a window with a child."
A spokesman for the McCanns has instantly rubbished Flores' claims, saying that there is 'no proof' Maddie died in the apartment or 'anywhere else'.
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"This person [Flores] is presenting himself as a criminal expert and is regurgitating claims made by Mr Amaral; he is repeating all the old assertions it seems for shock value."
This report comes in light of another new theory, released only last month, by British detective Mark Williams-Thomas.
Credit: ITV
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He claims Maddie had woken up in the night and gone to find her parents; but he remains unsure as to what happens next.
Theories about Maddie have got people in trouble before.
Goncala Amaral, in his book, wrote that Kate and Gerry had covered up Maddie's death with a pretence that she had gone missing.
Amaral was taken to court by the McCanns but recently won a libel battle against the British couple.
The apartment block where Maddie and the McCanns were staying. Credit: PA
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Perhaps one of the biggest breakthroughs in the case could come with a worker at the Ocean Club resort at the time Maddie disappeared.
Police are searching for the person as they believe they 'kept secrets' from them as they carried out the initial investigation 10 years ago.
Featured Image Credit: PATopics: Kate McCann, Portugal, Gerry McCann, Madeleine McCann