A 55-year-old man was allegedly beaten to death by some people in the Amjhupi Purbapara area of the district's Sadar upazila on Wednesday.
The deceased was identified as Abul Bashar Molla, a resident of the Amjhupi area.
Shah Dara Khan, officer-in-charge of Sadar Police Station, said Abdul's son Salahuddin had constructed a speed-breaker in front of his grocery shop.
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On Wednesday, Salauddin had an altercation with the driver and the salesman of Speed Energy Drink company as their vehicle got stuck while negotiating the speed-breaker.
At one stage, the workers of Meherpur Palli Bidyut Samity also joined them and beat Salauddin up mercilessly. When Abul tried to save his son, he was also beaten up.
A critically injured Abul died on the way to hospital, the OC said.