Ramasamy Soogumar, 59, yesterday admitted in a court to three offences for causing hurt to a police officer and a National Environment Agency (NEA) officer whose colleague had summoned him for smoking in an unauthorised area, The Straits Times reported.
With a little over a year in his release in June last year after serving an 11-year, 12-stroke sentence for robbery with hurt, Soogumar, who works as a cleaner at a school, got into trouble with the law again.
After identifying themselves, the officials wrote up a notice for Soogumar to attend court for committing the offence.
He then hurled vulgarities in Tamil at Gugan, bumped into him using his chest and slapped him.
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Sergeant Christian Tan Kai Jun, who was on a routine patrol in the area with another police official, then spotted the two NEA personnel calling for assistance.
He then repeatedly tried to confront Gugan in the presence of the police officers. They stopped him and told him to sit.
The Indian-origin man also tried to assault Staff Sergeant Lionel Tan Wei Ming's face but was stopped.
Undeterred, he then tried to move towards Gugan and when Sergeant Christian Tan tried to stop him, he slapped the police official's hand away.
Soogumar threatened Gugan in Tamil by saying "You watch out. I will deal with you" and that he would "die" at his hands.
He had been earlier sentenced to prison after conviction for disorderly behaviour, using abusive language and robbery with hurt.