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Who Killed Alberto Nisman?

Alberto Nisman, Argentina's special prosecutor, had just accused the government of covering-up the country's deadliest terrorist attack. But he never got to testify before Congress.

He was found dead in his flat. Was it suicide or murder? In an exclusive interview the BBC's Wyre Davies speaks to Alberto Nisman's former wife.

She says he was murdered and the official investigation into his death flawed. Davies also meets the last person known to have seen Nisman alive. In a tale of corruption and international espionage Our World asks - who killed Alberto Nisman?

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32 seconds