Security guard K Sathiasilan, 45, urged the police to arrest the culprit and bring the individual to justice.
“This was the first time that such an incident had occurred at the 21-storey flats,” he said today.
The boy’s mother, MS Kasthuribai, 45, was still traumatised by the incident which happened when she was with her son.
“I am still haunted by the sight of my son lying in a pool of blood,” said Kasthuribai, who works as a cook.
She said the incident occurred when she and Sathiswaran were returning home after visiting her disabled brother nearby.
“I told my son to buy a RM10 prepaid card at a sundry shop on the ground floor. My son emerged from the shop and told me the prepaid cards were sold out.
“It was at that time that the office chair fell and struck my son’s head,” she said.
She asked passers-by for help and called her husband before taking Sathiswaran to the University Malaya Medical Centre where he was pronounced dead.
Kuala Lumpur CID chief SAC Rusdi Mohd Isa said police were in the midst of identifying the individual who hurled the chair from an upper floor of the multi-storey flat.