Kieren Fallon, the six times champion jockey and the winner of yesterday's Irish Derby, has been charged by police in London in connection with allegations of race-fixing.
He was released on bail after he attended a London police station this morning and is due to appear in court on 17 July.
Mr Fallon flew to London after his win at The Curragh yesterday and is one of five people who have been charged so far today by City of London Police following a long-running investigation into alleged corruption in horseracing.
Mr Fallon presented himself at London's Bishopsgate Police Station and was charged with conspiracy to defraud customers of the online betting website, Betfair.
Jockeys Fergal Lynch and Darren Williams have been similarly charged, as has former racing syndicate director Miles Rodgers who also faces a money-laundering offence.
A fifth person, Joanne Richardson from south Yorkshire, has also been charged.
The police investigation - codenamed Operation Crypton - is the largest of its type ever undertaken.
It involved more than 130 officers looking at over 80 races which were run between December 2002 and September 2004, when the first arrests were made.
Betfair had passed records of betting patterns to the Jockey Club which then called in the City of London Police.
