Brückner was born in Bavaria, Germany, in December 1976.
It is reported that he spent time in care while growing up.
He has previously been convicted for drug, theft and child sex offences.
Prosecutors have said he lived “more or less permanently” in the Algarve between 1995 and 2007.
In the immediate wake of Madeleine McCann’s disappearance, he was not closely investigated.
But he was named as a suspect by German investigators in June 2020 in what they have classed as a murder inquiry.
Portuguese authorities subsequently named him as a formal suspect, or an arguido, in 2022.
No charges have ever been brought against him and full details of the German investigation have never been released.
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