Khaplang, 77, died at the NSCN-K headquarters in Taga in Myanmar's Sagaing Division on June 9.
Konyak, an Indian Naga, is associated with the Naga insurgency movement since late 1960s.
Konyak, who held the rank of Lieutenant General in the Naga Army -- the armed wing of the NSCN-K, was elected as Vice Chairman of NSCN-K in May 2011. He had undergone guerrilla warfare training in East Pakistan (now Bangladesh) and in China.
Konyak had held the post of Chairman, Konyak Region, and president of the Tuensang-Mon Regional Union
Apart from military services, Konyak had held the post of Chairman, Konyak Region, and president of the Tuensang-Mon Regional Union.
Khaplang started the Naga armed struggle in the early 1960s by forming the Naga Defence Force after Zapu A.Z. Phizo declared war on India. Later, he became Vice Chairman of the Eastern Naga Revolutionary Council.
Khaplang was instrumental in paving the way for the Phizo-led Naga National Council rebels, including his former friend-turned-rival Thuingaleng Muivah, to reach China for guerrilla warfare training.
After the failure of the Shillong Accord signed between the Centre and Phizo's Naga National Council in 1975, Khaplang and Muivah went underground. The two Naga rebel leaders, along with Isak Chishi Swu, formed the National Socialist Council of Nagaland in 1980.
However, the group split in 1988, with Khaplang parting ways with Swu and Muivah due to clan rivalries between the Konyaks of Nagaland's Mon district and the Tangkhuls of Manipur's Ukhrul district. 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.