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.

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

Murder at the Berlin Wall

Witness History

Murder at the Berlin Wall