The girl, Neeraj, and Rahul (21) were in a relationship to which her family objected. Her charred body was found in a field here on December 21, Circle Officer Alley Hasan said.
According to police, she was strangulated to death and the body set afire.
Later, her family members lodged a complaint against Rahul accusing him of the girl's murder following which police took up a probe that revealed her father and two others killed her, Hasan said.