A man suffering from breathing complications and kidney problem, died at the isolation ward of Khulna Medical College Hospital (KMCH) early Wednesday.
The deceased was identified as Mizanur Rahman, 52, resident of the district's Phultala upazila.
Dr Surendra Nath Biswash of KMCH isolation ward said the man was admitted to the ward at 1am and he died after about an hour.
Samples of the deceased were collected for coronavirus test, he said.
Meanwhile, 10 more people died from coronavirus in Bangladesh in the last 24 hours till Wednesday morning, taking the death toll in the country to 120.
Besides, 390 more people tested positive for coronavirus during the period, raising the number of confirmed cases in the country to 3,772.