Jubo Dal leader Zahir Fakir, 50, died on Wednesday night while being taken to hospital after being found in a bloodied condition beside a road in Sonargaon, Narayanganj.
Locals found him near a madrasa in the Balurghat area of Char Kishoreganj at around 9pm on October 21.
Fakir was president of the Kalapaharia union unit of Juba Dal in Araihazar and the first convener of the Araihazar upazila unit of the organisation. He was originally from Khaliachar village in Araihazar but lived in Balurghat, Char Kishoreganj, in Sonargaon.
The circumstances in which he sustained his injuries remain unclear. It has not yet been established how he was injured or whether any other factors were involved in his death.
Abdul Barique, officer-in-charge of Sonargaon Police Station, said Fakir died after being taken to hospital.
The cause of death remains unknown. His body was sent to the morgue of Munshiganj General Hospital for an autopsy, the OC said.