Nalini is presently serving a life sentence in Vellore women prison.
In the petition filed by Ravichandran, he said that he had undergone imprisonment for 26 years and was released on parole three times earlier during the period.
However, the police raised an objection to release his parole citing difficulty in providing security to him.
Besides Nalini, Perarivalan, Murugan, Santhan, Robert Pious, Jayakumar and Ravichandran were convicted in the case.
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