A convicted prisoner of a murder case, died at the Jashore Central Jail on Thursday.
The deceased was Mohammad Iqbal Sheikh, son of Abdul Khalek Sheikh of Shamnagar village in Fakirhat upazila of Bagerhat.
Md Abu Taleb, jailor of Jashore Central Jail said Iqbal was taken to the jail hospital after he fell unconscious in the morning.
Later, he was shifted to Jashore General Hospital as his condition deteriorated where the physicians declared him dead. The physicians suspected that Iqbal had a heart attack.
Iqbal was awarded death penalty in a murder case in 2009 which was commuted to life term imprisonment by the High Court on 2014.