NATIONAL Serviceman Dave Teo Ming was often caned by his mother when he was a young schoolboy and his father was in and out of jail for various offences.

His mother would beat him sometimes for no discernible reason or whenever she lost money on gambling.

And the beatings were no "normal beating'.

'The cane anyhow whack, whack until I got bruises,' he said in a psychiatric report submitted by the Institute of Mental Health, which was tendered in the High Court on Monday, when he was sentenced to nine years and two months, with 18 strokes of the cane for unlawful possession of a rifle, bullets and a knife.

The report presented a picture of his disturbed upbringing, scarred by constant beatings, rejection by his own mother who left him in the care of his paternal grandparents when he was in Primary one or two, after she walked out on him with his younger sister.

Teo's grandparents and aunt confirmed the beatings and remembered how traumatised Teo was as a child. They reported that his mother would even throw chairs at him.

After she left the family, the grandparents became the main caregivers to Teo and his brother who was two years younger.

Although he was not beaten as much, his paternal uncle, who lived with him, would punch and slap him if he misbehaved during his teens.

When he was 14, his younger brother was killed in a road accident.

This caused Teo 'to spiral downwards with disciplinary problems', said the IMH report. 'He was filled with anger and 'hated everybody''.

He became depressed and isolated himself from the family.

The behavioural problems and brushes with law continued, and he had to drop out of school at Secondary 3.

Possessive boyfriend
Teo started dating Ms Crystal Liew when he was 16. She was then 14. The relationship graduated to a sexual one when she turned 16.

By his own admission, Teo was a highly possessive boyfriend.

When she went out with her friends, he would feel extremely jealous and become abusive of her. He would call her up and demanded that she went home immediately.

There were times that he would hurl vulgarities at her and he also admitted that he had hit her several times, according to the IMH report.

In early 2007, Teo was posted for a short stint to Taiwan as part of his national service.

The couple continued to quarrel over the phone and in April last year, they broke up.

That was the final act and Teo snapped.

'He had nightmares about dying or being killed and in his waking hours, thought of suicide,' said the psychiatric report.

His sleep became disturbed, he lost weight over the next few months and he became withdrawn. His concentration became poor and 'his libido also dropped'.

In camp, he became easily irritated, and vented his anger by kicking the cupboard and being rude to his superiors.

He also began to hear voices of people who were not there.

Stalked ex-girlfriend
When he returned to Singapore from Taiwan, he started stalking Ms Liew, hanging out at her condominium and outside her school.

He even went absent without leave from camp to spend his nights at a stairwell at her condo. He was eventually caught and sent to the SAF detention barracks.

After he stopped contacts with Ms Liew, he went further downhill. He no longer cared about his appearance, became reclusive and started drinking to overcome his insomnia.

'He became self-destructive and recalls exercising till the point of exhaustion and then denying himself water,' said the report.