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Last September, a man in his twenties was found dead in Portman Avenue, a suburban street in west London. He had suffered horrendous injuries to his head and face. He had no identity papers on him and no one had reported him missing.

Rob Walker follows the Metropolitan police investigation into who he was and how he arrived in Portman Avenue. It is a story that spans two continents and eight countries.

(Image: E-fit, issued by the Metropolitan Police. Anyone with information about the whereabouts of Jos茅 Matada鈥檚 next of kin should contact the Metropolitan Police on +44 20 8247 7249)