The deceased, Mousumi Akter, 13, was the daughter of Mofiz Uddin of Dakkhin Laofula village. She was a class-VI student at a local high school.
Mofiz alleged that his elder brother’s son Sujon was locked in an altercation with his daughter, claiming that a goat of Mousumi damaged brinjal plants of Sujon.
At one stage, Sujon became furious and hit Mousumi in the head with a stick, leaving her seriously wounded, he added.
Mousumi was admitted to Madhupur Upazila Health Complex where she died around 2:00am yesterday.
Mofiz filed a murder case against Sujon and three others of his family with Madhupur Police Station.
Safiqul Islam, officer-in-charge of the police station, said all the accused went into hiding.
Police were trying to arrest them, he added.