Dmitri Kovtun's former wife appeared to contradict his own claim that he was a director of an oil company in 2006.
Mr Kovtun, who is accused of Alexander Litvinenko's murder, had fled to Hamburg in Germany and sought political asylum, the inquiry was told.
During an interview with British police in December 2006, Mr Kovtun listed his jobs as director general of gas and oil provider Global Project and an employee of Continental Petroleum Limited.
But in an extract of a police interview given by his ex-wife Inne Hohne, which was read to the court, she said he "wanted to be a porno star" and that he had "absolutely nothing to do with" the oil trade.
The inquiry into Alexander Litvinenko's death has heard his statement on how he was poisoned. ITV News Correspondent Juliet Bremner reports.
Marina Litvinenko has told the inquiry into her husband's death about the days leading up to his poisoning.
The widow of poisoned spy Alexander Litvinenko told an inquiry into his death that he would not have acquired the materials that killed him.