Taluka Purty, the victim's paternal uncle, raped her in one room of the house on Friday night at Karlajori village under Muffassil police station area.
The girl's grand-mother was in another room when the incident happened, police said.
The villagers reached the spot on hearing the scream of the victim, caught hold of the accused and beat him up.
Purty was later taken to a hospital in Chaibasa where he succumbed to his injuries on Saturday afternoon, police said.
The girl was sent for medical examination.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)