Congress leader Anil Shastri today said he would write to Prime Minister Narendra Modi seeking declassification of the files on his return from abroad.
"Truth must come out and whatever documents are there should be in public domain," he said, insisting it was necessary in view of continued doubts surrounding Shastri's sudden death in Tashkent in the Soviet Union on January 11, 1966, aged 61.
He said when his father's body arrived in India, it had "blue marks" and "white spots", which indicated "foul play".
"I personally feel there could have been foul play. Can't say so conclusively, but the negligence is clear, everyone went scot free, no one was punished," he said.
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"There was a butler who was arrested and released. My mother wanted to meet him when she went to Tashkent. But she was told he could not be traced," Shastri said.
He also said it was "very shocking that both his personal physician RN Chugh and personal assistant met with accidents. Both had to depose before the inquiry commission probing Shastri's death. "Coincidence twice is a little improbable," he said.
Anil Shastri said his father's personal diary was never found. "He jotted down notes daily in it. It could have mentioned Tashkent Agreement. Even the thermos next to him was never brought back. His death could have been from something in the thermos flask," he added.
Another son of the former PM Sunil Shastri, a BJP leader, also said he had requested several Prime Ministers in the past for declassifying the files pertaining to his father.
Naming a few, he said he approached Chandra Shekhar, IK Gujral and Manmohan Singh but "never got any answers".