Sanatan Thakur, accused in inserting the needle in the body of the Purulia-based girl, was arrested during a joint raid in a temple by Uttar Pradesh police and Purulia district police yesterday.
Acting on a tip-off, the joint raid was conducted to Renukoot in Uttar Pradesh where Thakur was hiding as a saint, he said.
The girl, who was apparently made a voodoo doll by Thakur, died on July 21 at a state-run hospital in the city.
The girl was suffering from severe trauma due to alleged sexual abuse and the torture by the man.
The girl's mother has also been arrested for her alleged involvement with Thakur in the plot of killing her own daughter.