He was an Indian Police Service (IPS) officer of Maharashtra Cadre of 1988 batch and alumnus of St. Xavier's College, Mumbai.

[2][3][4][5][6][7] During 2013 Indian Premier League spot-fixing and betting case, Roy was responsible for the arrest of Vindu Dara Singh who allegedly had links to bookies in spot fixing.

While investigating the attack on mobster Dawood Ibrahim's brother's driver, Roy commented to reporters about the ATS, "We are keeping a tab on the changing scenario in the underworld.

[1] He was diagnosed with cancer in his ankle in 2015, which had spread to his brain, as confirmed by the well-known neurosurgeon, B. K. Misra of Hinduja Hospital, to whom Himanshu sent his reports for diagnosis.

Upon media attention of Roy's death, Tripathi issued a statement on behalf of the family: "There were many among you who reached out to us yesterday to offer condolences at this time of grief.