Katrice disappeared from a Naafi shopping complex in Schloss Neuhaus, Paderborn in Germany on 28 November 1981. She was just two years old.
Her sister, Natasha, and her parents, who lived nearby at the time, have never lost hope that they will find out what happened to Katrice and they urge anyone with information to get in touch.
The accompanying age-progressed image has been created by the charity Missing People to suggest how Katrice might look aged 28.
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