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Eleven others have been sentenced to life in prison.
In 2011, assailants barged into the home of Tipu Sultan in Madhabpur Upazila in the northeastern district and attacked him with a sharp weapon leaving him dead.
On Wednesday, the court of additional district and sessions judge delivered the verdict with four of the convicts in the dock, said Prosecutor Sirajul Haque Chowdhury.
He said the court acquitted three people as charges against them were not proven beyond doubt.