A man whose lies helped to make the case for invading Iraq - starting a nine-year war costing more than 100,000 lives and hundreds of billions of dollars - will come clean in his first ever British television interview tomorrow.
"Curveball", the Iraqi defector who fabricated claims about Iraq's weapons of mass destruction, smiled as he confirmed how he made the whole thing up. It was a confidence trick that changed the course of history, with Rafid Ahmed Alwan al-Janabi's lies used to justify the Iraq war.
He tried to defend his actions: "My main purpose was to topple the tyrant in Iraq because the longer this dictator remains in power, the more the Iraqi people will suffer from this regime's oppression."
The chemical engineer claimed to have overseen the building of a mobile biological laboratory when he sought political asylum in Germany in 1999. His lies were presented as "facts and conclusions based on solid intelligence" by Colin Powell, United States Secretary of State, when making the case for war at the United Nations Security Council in February 2003.
But Janabi, speaking in a two-part series, Modern Spies, on BBC2, says none of it was true.