[2] He was also minister in Hiteswar Saikia and the Tarun Gogoi led Congress ministry several times.
His father, the late Santosh Kumar Roy, was a member of Assam Legislative Assembly for Katlicherra from 1972 to 1978.
[10] On 11 August 2019, Roy joined the Bharatiya Janata Party in the presence of the then finance minister Himanta Biswa Sarma.
[11] He was the Bharatiya Janata Party candidate for the Katigora constituency in the 2021 Assam Legislative Assembly Election.
He received 76,329 votes, losing to the current Member of Assam Legislative Assembly for Katigora Khalil Uddin Mazumder.
His son Rahul, like his wife, is a former member of Assam Legislative Assembly for Algapur serving from 2006 to 2011 on the Indian National Congress ticket.
[17] His son sought the Udharbond constituency as an independent in the 2021 Assam Legislative Assembly election but lost.
His son Rahul is married to Daisy Roy, who was also an independent candidate in the 2021 Assam Legislative Assembly election for Algapur but also lost.