Official sources said that the leader of the Naga insurgent group who had been ailing for quite sometime, died following a cardiac arrest.
Khaplang was a Hemi Naga from Myanmar and was based mostly in that country where the outfit maintains several camps.
Since 1980s, the outfit has engaged in subversive activities, including attacks on security forces, extortion and looting.
Born in April 1940 in Waktham village, east of Myanmar's Pangsau Pass, Khaplang joined the Naga nationalist movement as early as 1964 and was one of the key people in the formation of the NSCN.
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He formed the group following differences with the NSCN (IM) leaders Isak Chishi Swu and Thuingaleng Muivah. Swu died in June 2016 in a Delhi hospital.
Khaplang also entered into a ceasefire with the central government in 1997 but abrogated it on March 28, 2015.
Meanwhile, Naga Peoples' Movement for Human Rights (NPMHR) Secretary General Neingulo Krome said the news of Khaplang's sudden demise has come as a "rude shock".
This was so especially at a time when the Naga people are extremely in need of elderly and experienced wisdom of their national movement leaders, to set right the course of the Naga destiny, which is being misinterpreted and re-interpreted in the present day scenario of internal conflicts, he said.
There was no immediate reaction from the rebel group or key tribal bodies including Naga Hoho and Naga Mothers' Association.
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