On 29 March 1974, Czesław Kukuczka stormed into the Polish embassy in East Berlin, threatening to detonate a bomb unless he was allowed to escape to the West.

Shot at point-blank range while trying to cross the Berlin Wall, the identity of Kukuczka's killer remained a mystery for decades - until archive documents led investigators to former Stasi officer Martin Naumann.

Naumann's historic trial made him one of the first former Stasi officers to be convicted of murder.

Dan Hardoon speaks to Dr Filip Gańczak, the historian whose work helped bring Kukuczka’s killer to justice.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

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(Photo: The Berlin Wall. Credit: Owen Franken/Corbis via Getty Images)