A bachelor, Shanmugam was the chief minister of Puducherry from March 22, 2000 to October 27, 2001 and represented the union territory in the Lok Sabha between 1980-1991.
Condoling the death of Shanmugam, Union shipping minister and Congress leader GKVasan expressed his grief.
Vasan, in a statement, said Shanmugam dedicted his life for the welfare of Puducherry's people and was a close associate of late Congress leaders like K Kamaraj and GK Moopanar.