The UK's National Lottery operator Camelot has been fined £3m (€3.5m) by the British gambling watchdog after paying out a £2.5m (€3m) jackpot to a convicted rapist who probably submitted a fake ticket.
The penalty - to be donated to good causes - was handed down by the UK's Gambling Commission after the man claimed the prize with a "deliberately damaged ticket" in a suspected fraud that was not discovered for six years.
Hertfordshire Police arrested a 50-year-old in October last year, named in reports as Edward Putman, on suspicion of fraud by false representation but he was later released without charge. The arrest followed information from Camelot following the death of a corrupt security official at the company who was said to have been part of the plot, The Times reported.
Putman was jailed in 1993 for rape. Details of his 2009 lottery win emerged when he was jailed three years later for fraudulently claiming housing benefit and income support after telling the authorities that he needed handouts from his family to survive.
The £3 million penalty imposed on Camelot included £2.5 million "to represent the amount that would have been received by good causes had the prize claim not been paid", the commission said.
Camelot chief executive Andy Duncan apologised for the firm's failures, calling it "unique" and "not repeatable today".
He told reporters: "Effectively, a claim was made with a deliberately damaged ticket, we believe. The prize that was paid out for that claim was £2.5 million.
"That person submitted a claim, it went through the normal prize payout process and at the time, based on the evidence available, from what we can see after the event albeit a long time ago, that seemed to be a reasonable decision to have made based on the evidence at that time.
"It was only when subsequent evidence came to light in autumn of 2015 that it cast doubt on the original decision. So it couldn't have been known at the time."
Mr Duncan declined to answer questions about whether the alleged fraud was an inside job, or whether the firm still possessed the dodgy ticket.
But he said no-one else came forward to claim the money, and it would not have been included in a subsequent rollover.
The commission said while its investigation "could not be certain a fraud had taken place, it was more likely than not that a fraudulent prize claim had been made and paid out".
It ruled that Camelot breached the terms of its operating licence over control of its databases, the way it investigated prize claims and its processes "around the decision to pay a prize".
But it added that the firm had already taken steps to ensure that a similar problem would not happen again.
A Hertfordshire Police spokeswoman said: "An allegation of fraud connected to a lottery win from 2009 was investigated by (our) specialist cyber and financial investigation unit working with the Gambling Commission.
"As part of the investigation a man was arrested on suspicion of fraud by false representation. Following a thorough investigation the man was released with no further action to be taken against him."
It said the man was a 50-year-old from Kings Langley. Nobody was at home at Mr Putman's home in Kings Langley on Friday when visited by the Press Association.
A £2,525,485 jackpot from a draw on March 11 2009, went unclaimed until shortly before the September 7 deadline the same year for it to be given to good causes, according to news reports at the time.
The winning ticket was reported to have been bought in the Worcester or Malvern areas of Worcestershire.