This can happen only in this country . The whole country knows who did this and why.
The PM had met the first PM of Pre-Independence India during this visit. He was planning to announce this to the country. If this was allowed, the power would slip away entirely from the first family of the political party who has always considered this country to be their personal fiefdom post independence. Also they had a personal vendetta against this person and were so scared that they kept secret service vigil for many decades under the orders of the allied powers . To cover up this truth and to hide their Vile deeds, the best guess is that they decided to bid adieu to the then PM who had anyways stopped paying heed to this family.
Such grave crimes. Yet they roam free.