Former media mogul Conrad Black sent back to jail after US judge rules he must pay the price for defrauding investors

A US appeal process has culminated in an extra term in prison for Conrad Black after a judge ruled the once-powerful media mogul has had not been punished sufficiently for defrauding investors.

Black, whose newspaper empire spanned several continents, was sent back to prison for another 13 months after US Judge Amy St Eve responded to appeals against the freeing of Black on bail for two years.

He was convicted in 2007 of defrauding shareholders in media holding company Hollinger of $6.1million (£3.8million) but freed in 2010 after the US Supreme Court court found an anti-corruption law unconstitutional.

Judge St Eve sentenced Black to 42 months in prison, but prosecutors say he will be given credit for the 29 months he has already served.

Unrepentant: Conrad Black, pictured here after sentencing in Chicago, December 2007, still denies wrongdoing

Unrepentant: Conrad Black, pictured here after sentencing in Chicago, December 2007, still denies wrongdoing

Black's wife, Barbara Amiel, seated on a courtroom bench, collapsed into the laps of other spectators as the sentence was delivered, and medics were called to attend to her.

Black had addressed the judge for about 20 minutes before the sentence was imposed. He did not concede any guilt.

'I never ask for mercy,’ he said, standing with his hands on the podium and looking at the judge, 'but I do ask for avoidance of injustice.’

Canadian-born Black, 66, renounced the citizenship of his homeland to become a member of the House of Lords and was known for a grand lifestyle.

With homes in New York, Toronto, Florida and London, the socialite Lord Black of Crossharbour was known to enjoy the company of the rich, powerful and famous, with his glamorous second wife, Watford-born journalist Amiel, by his side.

A jury convicted Black in 2007, and at the time Judge St Eve sentenced him to six and a half years for defrauding investors in Hollinger International.

But Black, whose empire once included the Chicago Sun-Times, The Daily Telegraph, The Jerusalem Post and small papers across the US and Canada, was freed on bail after serving two years to let him to pursue what would be partially successful appeals.

The 7th US Circuit Court of Appeals in Chicago last year threw out two of Black's fraud convictions but upheld one conviction for fraud and one for obstruction of justice. And it said Judge St Eve would have to sentence Black again for those two standing counts.

His big chance to squash the convictions arose in June of 2010, when the US Supreme Court sharply curtailed disputed "honest services" laws that underpinned part of Black's case. The appellate court that reversed two of Black's convictions cited that landmark ruling.

But the appellate judges said the one fraud and obstruction of justice convictions were not affected by the Supreme Court's ruling. The fraud conviction, the judges concluded, involved Black and others taking hundreds of thousands of dollars and had nothing to do with honest services: It was, they asserted, straightforward theft.