A prosecution witness against two men accused of plotting the killing of ICAC informer Tommy Chui To-yan will soon go on trial for rape, robbery and murder, a jury heard yesterday. Leung Sze-lai, 23, said he was driven by his conscience to give evidence for the Government in the case of Cheung Wai-ming, 40, and Wong Kwong-kai, 30, who deny conspiring to murder Chui in Singapore. He claims he briefly shared a cell with the pair at Eastern Court in March last year. The witness said Cheung confessed to him: 'We are the killers.' But defence barrister Kevin Egan suggested Leung was helping the prosecution because he did not want to spend the rest of his life 'rotting in jail'. The witness admitted he would soon go on trial for allegedly raping a woman three times and plotting to rob and kill her on Cheung Chau in January last year. Mr Egan told the jury of some of the allegations Leung faced. 'She was told she was going to be killed. Her body was going to be placed in a box, which was shown to her and she was told she was going to be concreted into the box and thrown into the sea,' he said. Leung has also been charged with murdering and plotting to rob a second woman in February 1997. Mr Egan said the witness was accused of holding down the victim's legs while an accomplice 'took a sharp knife and stabbed her nine times in the throat until she was dead'. 'The allegation is that after that you took her body and threw it into the Shing Mun River in Sha Tin. The allegation is she was also in a box when she was thrown into the river.' Leung admitted he would be standing trial in relation to these accusations. But he denied that he was giving evidence against Cheung, 40, and Wong, 30, to gain favour with the Government. Mr Egan asked the witness whether he was concerned about spending the rest of his life in jail if convicted of murder. 'Of course I am concerned about it. But I believe the law is fair because I have not done it,' Leung replied. Mr Egan said the Independent Commission Against Corruption was paying the rent and rates for accommodation used by Leung's wife and son, up to $19,426 a month. The body of Chui, alleged to have been the victim of a ritual triad murder, was found floating in the Singapore harbour on April 1, 1995. The trial, before Mr Justice Thomas Gall, continues today.