An Indian prisoner, Bablu Das, 25, died while in custody at Bagerhat district jail on Friday night.
He died while undergoing treatment at Bagerhat 250-Bed District Hospital.
Following an autopsy on Saturday, his body was kept in the hospital morgue.
Bablu Das was a fisherman from Harupoint of Kalinagar in South 24 Parganas, India.
He was arrested by the Bangladesh Navy on July 14 for allegedly fishing in Bangladesh鈥檚 maritime waters and was sent to Bagerhat jail through the court on July 15.
Bagerhat district jail superintendent Md Mostafa Kamal said that Bablu Das suddenly fell ill while using the prison restroom and experienced chest pain before collapsing to the floor.
He was immediately taken to Bagerhat 250-Bed District Hospital for treatment, where doctors declared him dead around 12:30am.
Doctors suspected that a heart-related problem might have caused his death.
An autopsy was conducted on Saturday in the presence of the executive magistrate and his body was subsequently stored in the hospital morgue. The Indian embassy has also been informed about the death.
Bagerhat 250-Bed District Hospital in-charge, Asim Kumar Samaddar, said that Bablu Das鈥� body remained in the hospital morgue following the post-mortem.
On July 14, the Bangladesh Navy personnel had detained 34 Indian fishermen along with two trawlers for illegal fishing in Bangladesh waters. Bablu Das was among them.
Currently, 70 Indian fishermen arrested in four separate operations remain in custody at Bagerhat district jail.
