He was 65 and was undergoing treatment for a liver ailment, party sources said.
He had to taste defeat at the hands of Shobhana George from the same constituency in 2001 assembly polls.
An advocate, Ramachandran had also served as bar council president of chengannur.
The body is expected to be brought to the state capital by an air ambulance this evening and the last rites will be held tomorrow.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)