The deceased was identified as Moyna Miah, a ward no 3 member of no 4 Dakshin-Paschim union Parishad.
His family members spotted his blood-stained body near a pond adjoining to his house.
On information, police recovered the body, said Rashed Mobarak, officer-in-charge of Baniachong Police Station, adding that the UP member might have been killed in a pre-planned way.
There were several injury marks on his body, said the OC.
Protesting the murder, local people staged demonstrations on Saturday morning.