Prosecutors say they’re “optimistic” they will crack the Madeleine McCann mystery – as the 14th anniversary of her disappearance approaches.
Hans Christian Wolters says a probe into Christian Brueckner, 44, is running “at full speed”.
And he hopes a new TV documentary, to be screened in the suspect’s native Germany on April 28, will uncover more clues.
Wolters said: “Even if the public does not notice it much, our investigations in the Maddie case continue to run at full speed.
“We still assume the accused, Christian B, killed Madeleine.
“Even though the investigation of a case that will be 14 years old in a few days is very difficult, we remain optimistic and hopeful that we’ll be able to solve the crime.”
Wolters said last June that he believed Madeleine is dead and identified convicted paedophile Brueckner as a suspect.
Brueckner is in jail for the rape of a woman in Praia da Luz, Portugal, the town where Madeleine vanished from an apartment on May 3, 2007 – days before her fourth birthday.
