A local trader in Benapole named Hasanuzzaman also known as Ahsan was murdered in Sadipur village on Monday.
A case was filed against three people in connection over the killing on Wednesday night.
Victim's son Shohagh filed the case with Benapole Port Police Station accusing Buno Akhter, 23, Raihan Uddin, 22, and Shujon Hossain, 26, UNB reported.
According to Sub-inspector Zakir Hossain, on the night of October 15, the accused took cigarettes and cups of tea from a shop at Sadipur intersection and went away without paying.
Hasanuzzaman protested it. Being angered over the incident, the criminals beat up Ahsan mercilessly, leaving him dead.