SINGAPORE - A 16-year-old who committed five killer-litter offences over a year, flinging objects like bricks and bicycle wheels from high floors, once with fatal consequences, was ordered to undergo 36 months' split probation on Monday.

Under the probation order, Abdul Hamid Rahmat, who has been remanded for the past nine months, has to live at the Singapore Boys' Hostel for 12 months, and must be accompanied by an adult at all times when he is outside the hostel and home.

He has to remain indoors from 9pm to 6am, undergo psychiatric and psychological treatment and counselling, and must also take any medication prescribed by the psychiatrist.

District Judge Lim Keng Yeow also ordered him to perform 200 hours of community service. The teen's mother, who was in court, and his stepfather, have to sign an $8,000 bond to ensure his good behaviour.

Abdul Hamid had admitted to two counts of causing grievous hurt by doing a rash act, and one of rash act to endanger the personal safety of others.

On May 16 last year, he had launched a bicycle wheel from the 14th floor of Block 1, Eunos Crescent, which hit a woman on the head.

The 67-year-old, Madam Mahani Abdullah, died on June 6 from sepsis due to a urinary tract infection.

The other two offences were for causing grievous hurt to Mr Kyi Phyu Phyo Wai by hurling a brick from the 12th storey of the block, breaking the 25-year-old's right finger, on Dec 13, 2013.

And on Aug 24 that year, he threw two ceramic tiles,a water dispenser and a dumbbell over the 13th floor parapet.

Judge Lim said Abdul Hamid's offences showed a "disturbingly high level of pre-mediation and planning".

He said the teen was assessed to have rather unique rehabilitation needs that had to be made through a highly specialised plan to address the underlying causes, while not compromising public safety.

A progress review will take place in two months.