The convict is Abdul Rahman, 50 of Tashopara village in Mohonpur upazila of the district. The court also fined him Tk 20,000.
Public Safety Disturbance Crime Prevention Tribunal Judge Akbar Ali Sheikh handed down the verdict.
According to the prosecution, Abdul Rahman killed his wife Rashida Bibi, 45, over family feud on October 18, 2014 and dumped the body in a waterbody near their house.
Police recovered the body of Rashida Bibi the following day.
A case was filed in this connection. Police arrested Abdul Rahman.
Also read: Man to die for killing wife in Barguna