The deceased was identified as Pravash Ray alias Hannu, 52, president of Bhadrabila union Awami League and resident of Mirapara village under the upazila.
Narail sadar thana OC Delwar Hossen Khan confirmed the matter.
Police and victim's family members said: “Pravash was hacked with a sharp weapon by a rival gang when he was returning home from Mirapara Bazar around 8pm. He was seriously injured. Locals rescued him and admitted him to Narail sadar hospital. Later, he was shifted to Jessore 250-bed hospital where he he succumbed to his injuries around 9:30pm."
The body was sent to the hospital morgue for autopsy.
Narail sadar thana police sources said a murder case was filed in this connection. He might have been killed for previous enmity, they added.