Former Governor James Ibori of Delta State on Wednesday lost an appeal against his conviction in the United Kingdom for laundering millions of dollars in stolen public funds, through British banks and properties.
Ibori was governor for eight years from 1999 to 2007.
He had pleaded guilty in a London court in 2012 to a 10-count of fraud and money-laundering, involving sums amounting to at least 50 million pounds ($66 million).
The 59-year-old received a 13-year jail sentence of which he served half, as is common in the British system.
He was released from prison in December 2016 after a court order.
Ibori, who is now back in Nigeria, appealed against his conviction, alleging misconduct by British Police and prosecutors, which he argued, tainted the judicial process.