Earlier, the parents had concocted the story that they had killed their daughter as she lost her mental balance after she failed in her exams a few years ago.
Investigation Officer Harinder Singh said during the detailed interrogation and investigation, it came to light that the girl had an affair with a boy of her village Sandaur for about a year.He said all the accused had confdessed to their crime.
The police said the girl had wanted to marry the boy of her choice against the wishes of her parents and relatives.
"The parents of girl failed to accept the relation of her daughter and did not want to marry her with the boy. The parents even restricted her from going to school after they got to know about the affair," police said.
The police have registered a case under section 302 (murder) and 201 (destruction of evidences) of the IPC Act.