The deceased was Nazrul Islam, 55, son of Siddiq Biswas of Upartola village of Mobarakpur Union while the injured was UP member Sabuj Ali Sujan, 32, a resident of the same village.
Officer-in-Charge (OC) of Shibganj Police Station Golam Kibria said Nazrul Islam had been at loggerhead with his brother Arfazul Biswas over the boundary of a land.
On Friday night, during an argument between them, Arfazul's son Anas Biswas, 18, allegedly stabbed his uncle Nazrul Islam in the stomach several times with a knife.
UP member Sabuj Ali Sujan was also stabbed while trying to save him.
Locals rescued and took them to Shibganj Upazila Health Complex where doctor declared Nazrul dead.
Injured Sujan was sent to Rajshahi Medical College Hospital for better treatment, reports UNB.