Similarly, the zonal team of DB (Mirpur) conducted raids at several places in the capital's Pallabi and Rayerbagh areas and arrested Sumon and Rocky around the same time.
DMP's additional deputy commissioner (ADC-Media) Iftakhairul Islam said that Sumon had plotted the murder and led the team of assailants.
"His quick interrogation led to the immediate arrest of Rocky in the Kalapani area of Pallabi," he said.
Two other accused in the case --Murad and Dipu -- were arrested earlier. While the Pallabi police nabbed Murad soon after the crime on 16 May, Dipu was held a day after.
On 16 May, the accused called up Sahinuddin on his mobile phone and asked him to come to Mirpur Section-12 on the pretext of resolving a land dispute.
When the victim reached the area around 4:00pm that day, the assailants attacked him before hacking him to death with sharp weapons in front of his seven-year-old son.
A murder case was filed at Pallabi police station on 17 May against several people, including MA Awal, Sumon and Rocky.