Dangwimsai Pul, in her letter written to Justices J Chelameswar, Ranjan Gogoi and M B Lokur, said her husband who had served as Chief Minister from February 19 till July 13, 2016, had committed suicide on August 9 last year.
The letter has not been addressed to the Chief Justice of India J S Khehar and the second senior-most judge Justice Dipak Misra.
Pul said the note contained a detailed narration of facts regarding the "sordid state of affairs in the polity and the judiciary, most of which were from his (Kalikho Pul's) personal knowledge.
"The note contains serious allegations of corruption in high places in the polity as well as in highest places in the judiciary and that led him to believe that there was no hope for the country," she said in her letter which was received by Supreme Court registry today.
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"These allegations had caused great despair not only to my late husband but also to the entire country. It is imperative therefore that these allegations contained in this note are credibly and thoroughly investigated by an independent investigating authority," it said.
"... A credible investigation in this case is essential otherwise the cloud of suspicion over the polity and the highest judiciary of this country, will forever loom," Pul said in her letter.
She said it was under these circumstances, that she was writing the letter to the three seniort judges of the apex court urging them to take an administrative decision on granting sanction to lodge an FIR and having this matter credibly investigated by an SIT.