Mark Koh, former Singapore police officer, sentenced after deportation from China for corruption linked to illegal gambling syndicates
After 17 years on the run, former CID officer Koh Kian Tiong—also known as Mark Koh—was sentenced to nine years in jail and fined S$1,000 for accepting S$47,700 in bribes from a gambling syndicate leader. The ex-assistant superintendent fled Singapore in 2007 but was arrested and deported from China in 2024
Bribes and Betrayal in the CID
At the time of the offences in 2006, Koh was an Assistant Superintendent with the Criminal Investigation Department (CID), specifically on the Anti-Unlicensed Money Lending Task Force. He accepted multiple cash bribes totaling S$47,700 from Chua Chin Hoe—a known gambling syndicate leader—between January 2006 and May 2007.
In return, Koh leaked confidential police intelligence on operations that could disrupt Chua’s illegal activities, and introduced Chua to other CID officers, facilitating connections that led to S$27,000 worth of paid entertainment for the officers involved.
Desperation and Debt Led to Corruption
Koh’s descent into corruption reportedly began during his divorce proceedings in 2005, which left him financially strained. After failing to secure a S$15,000 loan from a colleague, he approached Chua through another officer. Chua—referred to in court as “Ah Hoe”—agreed, handing over S$15,000 in Geylang with no repayment terms.
Later in September 2006, Koh asked for another S$16,000 to cover credit card debts. Chua paid without hesitation. Koh never repaid either amount.
Lavish Nights Out With Criminals
Beyond cash bribes, Koh and several other CID officers were regularly entertained at bars with drinks, hostesses, and tips fully paid by Chua. These interactions blurred professional boundaries and raised serious questions about systemic accountability within law enforcement at the time.
Chua’s bank records confirmed at least S$27,000 in expenses went toward wining and dining Koh and his associates during 2006 alone.
Flight, Arrest, and Return
In 2007, Koh left for China on personal leave. When he learned that the Corrupt Practices Investigation Bureau (CPIB) had launched an investigation into his dealings, he chose not to return. An Interpol red notice was issued against him.
Koh later landed in prison in China for unrelated offences. The nature of those offences remains undisclosed. Upon his release, Chinese authorities deported him to Singapore, where he was arrested at Changi Airport in April 2024.
Conviction and Sentencing
On May 21, 2025, Koh pleaded guilty to:
Five counts of corruption involving S$31,000
One count of desertion under the Police Force Act
An additional ten graft charges involving the remaining S$16,700 were taken into consideration.
On May 26, the court sentenced him to nine years’ imprisonment, imposed a S$1,000 fine, and ordered him to repay the full S$47,700. Failure to do so will add 47 days and one week to his jail term.
The sentencing of Mark Koh brings a long-running case to a close, reinforcing Singapore’s zero-tolerance stance on corruption—even when the accused is from the ranks of law enforcement. As trust in public institutions remains paramount, Koh’s fall from grace serves as a stark reminder that no one is above the law, and justice, even if delayed, will be served.
Sources: Malaymail (2025) , Straits Times (2025)
Keywords: Koh Kian Tiong, Mark Koh Bribery, CID Corruption, Illegal Gambling Singapore, Interpol Red Notice, Police Officer Bribe
