The investigators say the girl, who was kidnapped on January 10, was first raped the same day by Ram's nephew, a juvenile, and was killed on January 14.
Kathua rape and murder case: Accused demand narco test; Supreme Court wants J-K view on trial transfer
The eighth accused, a juvenile, was produced in the court of the Chief Judicial Magistrate where he moved a bail application.
After the hearing got over on Monday, Sanji Ram told reporters a narco test will make everything clear.
The victims biological father warned that they would launch an agitation if the government handed over investigation of the case to the CBI.
The brutal rape and murder of a minor girl triggered early seasonal migration of the nomadic Bakerwal community from Rasana village in the border district of Kathua.