A man, who was mercilessly beaten over land dispute in Parbatipur upazila on Thursday night, died at Rangpur Medical College Hospital on Friday.
The victim was Ahad Ali, 45, son of late Babu Sheikh of Dhakula (Kapashikopa) village in the upazila.
Police arrested Sanwar Ali, Hasinul Islam, Kalam and Sabuj Mia in connection with the killing.
According to locals, late Abdul Khaleque of Dhakula village had donated three acres of land to a local mosque 45 years ago but Sanwar and his family members have been claiming the land for last two years.
On Thursday night, Sanwar with his hired goons went to occupy the land but villagers stopped them.
Sanwar and his hired goons caught Ahad, one of the protesters, at Chowpathi Bazar in the upazila the same night and beat him up mercilessly.
Locals took him to Parbatipur Upazila Health Complex from where he was referred to Rangpur Medical College Hospital. He succumbed to his injuries there on Friday.
Police sent the body to M Abdur Rahim Medical College Hospital for autopsy.