The deceased was identified as Shamim Hossain, 33, joint convener of Islamkati union of Jubo Dal in Tala upazila of Satkhira district and son of Abdul Gaffar Sheikh of Uthli village in the upazila.
Masud Rana, officer-in-charge of Dumiria Police Station, said a group of miscreants killed him after slitting his throat at his house but the motive could not be known yet.
Family members of Shamim found him lying in a pool of blood and informed police who recovered the body in the morning.
The body was sent to Khulna Medical College and Hospital morgue.
Senior joint convener of Tala upazila unit Jubo Dal Saidur Rahman said it is a planned killing and he urged police to identify the killer.
Additional police have been deployed in the area to maintain law and order, reports UNB.