Tsapise Sangtam, who was injured in clashes at Longkhim on the night of January 31, succumbed to his wounds in a Dimapur hospital, Chief Minister TR Zeliang said today.
He, however, said the "type of clash" that left the person injured was yet to be ascertained.
Two youths were killed in firing during clashes in Dimapur near the private residence of the Chief Minister on the same night.
Earlier in the day, Eastern Nagaland Peoples' Organisation (ENPO) said Sangtam died on February 5 in a Dimapur hospital where he had been taken from Longkhim.