The Office of the Attorney-General (OAG) will file a lawsuit against a former Tourism Authority of Thailand governor for demanding a bribe from an American film-making couple in 2001.
The legal action came five years after the couple were convicted and sentenced in the US for the crime.
Gerald and Patricia Green were convicted in 2009 on charges of conspiracy, violating the US anti-corruption laws and money-laundering.
They were sentenced to six months' home detention and paid US$250,000 in restitution.
They were arrested in 2007 and found guilty of bribing Juthamas Siriwan, the then governor of the Tourism Authority of Thailand, to win contracts to manage and operate the annual film festival in Bangkok from 2002-06 during the Thaksin Shinawatra government.
The US indictment said the Greens paid US$1.8 million (57 million baht) in bribes to Mrs Juthamas' daughter via bank accounts in Singapore, New Jersey and Britain that were set up in the names of her daughter and a friend.
Vichai Vivitsevi, an anti-corruption commissioner, said on Wednesday Mrs Juthamas would be charged with violating anti-corruption laws.
The National Anti-Corruption Commission (NACC) also set up a committee to look into Mrs Juthamas's wealth at present.
In late 2013, the NACC sent the case to the OAG, who turned it down citing inadequate evidence.
The two agencies then set up a joint panel to work together and seek more evidence from the US.
The NACC is also seeking a return of the $1.8-million bribe to Thailand under a bilateral agreement with the US on criminal cooperation and a UN anti-corruption treaty.