Anand Kumar (30), secretary of Mettur block in Podanur area here had set himself ablaze on October 4, fearing arrest in connection with the incidents during the funeral procession of the outfit's spokesperson Sasikumar.
Some relatives and others had managed to douse the flames before getting him admitted to the Government hospital here.
Kumar, who suffered 60 per cent burns, died this afternoon, police said.
Police suspect he took the extreme step as they had recently questioned his colleagues about him.
On September 22, Sasikumar (36) was hacked to death by some persons while returning home on his two wheeler at night.
The state wide bandh called by the outfit next day, when his funeral was also held, had turned violent in some parts in Coimbatore, with a police jeep set on fire and three personnel sustaining burns.
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