Former Goldman Sachs banker Tim Leissner (above) has been slapped with a lifetime ban by the Monetary Authority of Singapore (MAS) after having pleaded guilty to 1MDB-related criminal charges in the US.

Singapore's The Straits Times reported that according to MAS, the ban will prohibit Leissner from managing any capital markets services firm in the republic and perform any regulated activity under its Securities and Futures Act.

He is reportedly also prohibited from serving as director, substantial shareholder or a capital market services licensee under the act.

Leissner, who was Goldman's former Southeast Asia chairperson, was indicted by the US Department of Justice on Nov 1, pleading guilty to conspiracy to launder money and conspiracy to violate the American Foreign Corrupt Practices Act (FCPA).

Leissner pleaded guilty to the charges, which stated he paid bribes to both Malaysian and Abu Dhabi officials as well as attempting to circumvent internal accounting controls of the bank while he was employed there.

Charged along with him were fellow former Goldman banker Roger Ng, who is currently under arrest in Malaysia, as well as fugitive businessperson Jho Low. The latter duo, however, were charged in absentia.

Quoting a statement by the MAS, The Straits Times reported that Leissner's guilty plea provided more evidence of his involvement in relation to 1MDB not previously available to MAS when it issued an earlier prohibition order against him.

"MAS was unable to interview Leissner as he was not in Singapore and could not be compelled to travel to Singapore to assist in investigations," MAS reportedly said, adding that it would take further enforcement action pending any new evidence on 1MDB fund flows.

Leissner was the lead banker involved in three 1MDB bond sales. He left Goldman in 2016 after being suspended for allegedly violating the firm's policies and was slapped with a 10-year trading ban in Singapore over improprieties related to 1MDB transactions.

Low, meanwhile, remains at large despite being charged with multiple criminal charges in the US and in Malaysia over the sovereign wealth fund. 

Low has denied any wrongdoing and says he will not return to Malaysia to face trial.

 Ng, meanwhile, is expected to be charged in Malaysia and is fighting extradition proceedings to the US.