An injured local Awami League leader, who was stabbed on Monday over a land dispute at Aranagar village in Dhamrai upazila of Naogaon, succumbed to his injuries on Tuesday.
The deceased was identified as Moshiur Rahman Babu, 50, president of Aranagar union AL unit of the upazila.
Soon after the incident, police in a drive arrested accused Raja, Yusuf Ali and Maruf Hossain for their alleged involvement in the killing, said Md Jakirul Islam, officer-in-charge of Dhamarai Police Station.
He said there was a previous land dispute between two people of the village. Moshiur Rahman was present on Monday while they were taking measurement of the land.
At one stage, the two groups locked in an altercation and one of them stabbed the AL leader, leaving critically injured.
Later, he was admitted to Patnitala Upazila Health Complex and was then transferred to Rajshahi Medical College Hospital where the duty doctor declared him dead on Tuesday morning.
A murder case was filed with Dhamarai Police Station in this connection, the OC added.