Raihan, 23, died at the ICU of the burn unit at Dhaka Medical College Hospital around 7.45 pm on Thursday.
Mizanur Rahman, 50, Badsha, 45, Masud, 28, and Nur Mohammad, 21, are under going treatment at the burn unit of DMCH.
Ninety per cent of the bodies of Masud, Raihan and Nur have burnt while 68% of Mizan and 40% of Badsha are suffering from burn injuries, According to DMCH.
Police and Fire Service sources said the fire broke out at an oil godown while unloading petrol from a lorry in Mijibari area of the road around 12.30am. Soon the fire engulfed the godown on the ground floor of a three-storey residential building and spread to the upper floors.
The residents of the floors took shelter on the roof and were rescued by ladders with the help of fire fighters and locals.
Five units of Chandpur Fire Station rushed to the spot and brought the situation under control after a hectic effort of four hours.
Several shops adjacent to the building were also suffered damage due to the fire. Md Faruk Ahmed, senior officer of the fire station, said the fire was devastating.
“We were able to save the area from severe danger, as we got sufficient water from the lake adjacent to the area and the vehicles of fire fighting units could reach the spot easily,” he added.
Ali Ullah, officer-in-charge of Sadar police station, said Mizan was doing business of petrol and octane using the ground floor of the three-storey residential building as a godown.
While visiting the site, Abdus Sabur Mandal, the district administrator, said it should be investigated whether the oil godown was running legally in the residential area.