An inmate was declared dead after being brought to Magura Sadar Hospital on Wednesday.
The deceased has been identified as Ali Akbar, 70, a resident of Barishat village in Magura's Sreepur upazila.
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Abid Hossain, the jailer of Magura District Jail, said that Akbar was serving a 55-year sentence for charges related to murder, robbery, and arms offenses.
He had been incarcerated since 1990 and was facing multiple health challenges, including high blood pressure and diabetes.
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He was brought to the hospital around 11 am from Magura District jail as he fell ill.
The on-duty doctor declared him dead around 12:20 pm while undergoing treatment there, he said.