Ong was also charged with aiding and abetting Iswaran, a public servant at the time, in obtaining gifts, which was taken into account when determining his sentence.
If convicted of dangerous driving, he faces a fine of up to S$5,000, a jail term of up to one year, or both, with enhanced penalties for repeat offenders.
Jessica Bergmann, 34, started communicating with the student over text messages and phone calls before the two engaged in sexual encounters that took place at Bergmann's home.
Money laundering under the Corruption, Drug Trafficking and Other Serious Crimes Act 1992 is punishable by up to 10 years in prison, a fine of up to S$500,000, or both.
Deviere Willette, 29, told the jury that, before his father's murder, he had recently revealed to Johnathan Willette, 46, that he was married to his stepmother, Devyn Michaels, 47