The 63-year-old Saroj Mohan Chakraborty shot himself dead at 11:30 am with the bullet piercing the skull above the right year, SDPO, Kalyani Chandrasekhar Bardhan.
Chakraborty kept the revolver of his securityman in a drawer in the house. The securityman was in an outhouse at the time of the shooting, Bardhan said.
A suicide note was found in the room, police sources said.