<p>For years, Mahmood Mattan's family believed in his innocence. But no-one would listen.
Then in 1969, a shocking revelation - another vicious attack which bore many of the hallmarks of the murder of Lily Volpert.
And the man responsible for that attack was also a vital witness in the case against Mattan.
Finally, could the family prove once and for all that Mattan was an innocent man who should never have been sent to the gallows?</p><p>Presenter and Producer: Danielle Fahiya
Sound Design: Cathy Robinson
Original Music: Rhodri Llewellyn John
Executive Producers: Karen Voisey and Andy Maguire
Story Consultant: John Norton
Production Manager: Andrea Deere</p><p>History Consultant: Chris Phillips.
Archive: BBC Black Britain; ITV Wales</p><p>James Callaghan, Edmund Davies & Melbourne Thomas - Richard Elfyn
Tom Driberg & Rhys Roberts - Rhys Downing
Harold Cover - Anthony Corria
Margaret Bush - Zoe Davies
David Wickham - Dean Rehman</p>
