Jubilation gave way to despair at Vellore Jail after the Supreme Court on Thursday stayed the release of convicts in the Rajiv Gandhi assassination case.
Nalini had earlier this month complained of harassment by jail officials. She had later alleged her life was under threat and that prison authorities had assaulted her.
Perarivalan is being treated at the prison hospital, police said.
Nalini Sriharan, who was sentenced to death for her role in the Rajiv Gandhi assassination conspiracy and later pardoned, walked out of prison for the last time on Saturday, November 12 evening, after about three decades of incarceration.
R P Ravichandran, one of the six convicts who was released on Saturday in the assassination case of former prime minister Rajiv Gandhi, said that the people of north India should see them as 'victims instead of terrorists or killers'.
Granting the interim stay, a bench comprising justices C Nagappan and M Sathayanarayanan observed there had been a delay of over 11 years in the disposal of the mercy petitions filed by the convicts to the President seeking clemency.
The three -- Murugan, Santhan and Perarivalan-- lodged in Vellore Jail, were scheduled to be hanged on September 9.
Nalini, who is serving a life term in the Rajiv Gandhi assassination case, on Tuesday ended her two-day long indefinite fast demanding her premature release, after Vellore jail officials assured that her plea would be considered as per law. Nalini broke her fast today morning after the prison officials prevailed upon her to do so and assured her that her plea would be considered as per law, according to jail authorities.
"It's completely personal, I don't want to say anything about it," she told CNN-IBN. But "I did visit Vellore to meet my father's assassins."
The seer had spent two months in custody in connection with a murder case.
The Kanchi seer has moved the Principal Sessions Court in Chennai for anticipatory bail, apprehending arrest in another case.
The Supreme Court on Monday granted him bail in the Sankararaman murder case with the condition that he will not visit the Kanchi mutt till investigations in the case are over.
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Is Stalin positioning himself as a central figure in the anti-Bharatiya Janata Party, anti-Narendra Modi formation?
'There is no senior bureaucracy functioning now; these people only obey.' 'This is only a command and control kind of governance.'
'Those days, none of the leaders thought of amassing wealth.' 'All of them wanted to sacrifice their all for the country.' 'There are many who didn't have any money, but sacrificed their lives for the country.' 'There are many who spent their own money and worked for the country.' 'There are many more about whom we do not even know what they had done; they did everything so silently and selflessly.'
President Ram Nath Kovind, Vice-President M Venkaiah Naidu, Prime Minister Narendra Modi, Bharatiya Janata Party chief Amit Shah, Congress president Rahul Gandhi and other leaders condoled the death of the seer.