He blamed the Centre--both the previous UPA government and the incumbent NDA--for opposing the release of seven Rajiv Gandhi case convicts, including him.
Former chief minister Jayalalithaa had in 2014 announced her government would release all the seven convicts in the Rajiv Gandhi assassination case.
"We do not know why our release has been put on hold." Payas said.
On May 21, 1991, Rajiv was in Sriperumbudur, where he was killed, to campaign for the alliance between Jayalalithaa and the Congress. She became chief minister for the first time through the 1991 elections.
Payas said Jayalalitaa's decision to release the convicts was reflective of the aspiration of Tamils not only in Tamil Nadu, but across the world, to see them free.
He said the Centre has "decided that our lives must end in prison".
Stressing that the "silence of the governments (including Tamil Nadu) only tell us this (that their lives should end in jail)," he said he understood that the intention of the state and Centre was to confine them in prison.
"I have come to the conclusion that there is no use living when there is no scope for release," he said, adding that the very long prison sentence has punished not only him, but also his family.
On 11 June this year, he completed 26 years of incarceration and entered the 27th year, he said.
The thought of seeking euthanasia has now become deeply entrenched, an idea which did not surface in the past, he said.
"Also, for the past many years since none of my family members or relatives have visited me I do not think that there is any meaning in my life."
Claiming that Supreme Court Judge Justice Wadhwa had held him to be "not guilty," in 1999, he said still he continued to serve the prison sentence and it greatly anguished him.
(With PTI inputs)