Giridih District and Additional Sessions Court Judge Sunil Kumar found Mathura Yadav guilty of the crime that took place at Badidih village.
The court also awarded a two-year rigorous prison term to his father Bhikari Yadav for hiding the body in a bush to tamper with evidence.
Mathura Yadav lured the girl with mangoes, took her to a nearby forest and perpetrated the crime. He chopped off the head of the little girl with an axe.