A man, Mr Lim Kok Boon, was allegedly assaulted by two men with helmets in Kampung Melayu, Air Itam, on Friday (22 September) and died three days after the attack.
Officer in Charge of Police District (OCPD) Asst Comm Anuar Omar said police had been searching for the two since Saturday after a man was allegedly assaulted by them.
The incidence took place when the two alleged attackers were packing drugs in the 14th floor rubbish room when Mr Lim, 33, a wallpaper shop worker, walked in on Friday. Frightened, the men quickly threw away the drugs as they thought Mr Lim was a police officer.
They started attacking Mr Lim with helmets after they recognised him as someone they knew.
Mr Lim succumbed to head injuries at about 10am on Monday.
One of the alleged attackers had been arrested on Monday 10.10pm and brought to court yesterday for week-long investigations. The 23-year-old is known to be the accomplice of the other alleged attacker, 38, who is yet to be found.
The manhunt for the 38-year-old drug pusher is ongoing. Police have ruled the case as murder under Section 302 of the Penal Code.