A prisoner died in Dhaka Central Jail on Thursday morning.
The deceased was identified as Sohel, 24, son of Yusuf Bepari.
Prison guard Abu Hanif said Sohel had been undergoing treatment at Dhaka Medical College Hospital for a long time as he was ill. After treatment, he was taken to jail.
But Sohel was again taken to the hospital this morning as he became ill.
Later, DMCH duty-doctors declared Sohel dead.