He represented the Tezpur constituency of Assam and was a member of the Indian National Congress (INC) political party.
He died[1] due to heart and brain stroke attack in Artemis Hospital New Delhi, on 27 May 2019.
In 2007, the Central Bureau of Investigation told the Supreme Court of India that Subba's nationality was in doubt, and that existing citizenship proofs were forged.
In Sikkim he is alleged to have run a chit fund company, then moved to Assam.
In between he partnered in a 5 star Casino hotel The Royal Plaza in Gangtok, Sikkim, which after his death has some property dispute going on.