Thai Deputy Prime Minister Wissanu Krea-Ngam said he would resign amid ongoing political crisis, local media reported Thursday.
Wissanu said he already informed caretaker Prime Minister Thaksin Shinawatra. "I will end my political career and will not be member or run in election under a political party. I will return to my teaching career," Wisanu said, according to newspaper The Nation's website.
Earlier reports said he has already submitted resignation which would take effect next month.
His announcement ended week-long rumor speculations after Dr Bowornsak Uwanno, former cabinet secretary general, resigned several weeks ago.
Wissanu declined to comment whether his resignation was caused by conflicts in the government.
It is reported that Wissanu had been a adviser to Thaksin through the caretaker premier's several key legal challenges, including Thaksin family's 1.9 billion U.S. dollar sale of the controlling stake in Shin Corp. to Singapore's state-owned Temasek Holdings company.
The tax-free deal has sparked wide spread anti-Thaksin protests earlier this year, which unseated the then prime minister following the dissolution of the Lower House.
Political experts said Wissanu's departure would deal a heavy blow on Thaksin's government.
Wissanu is one of six deputy prime ministers in the Cabinet. He was in charge of legal matters concerning the government and was one of Thaksin's top legal advisers.