The girl, a resident of Khoraon village, was having an affair with one Irfan (20) of the same village for the last 18 months, to which her father Jhallar Diwakar was opposed to, police said.
According to police, the girl, late last night, went to meet Irfan and her father came to knew about it.
The father reached the spot and brutally assaulted the girl with a stick and when she felt unconscious he dragged him to a field and hacked her, they said.
Police have arrested the father in this connection.
