Retired IPS officer N Balasubramanyam, a 1994-batch Andhra Pradesh cadre officer, passed away after battling cancer. He served as SP of Nalgonda and Mahabubnagar, held key intelligence positions and introduced technology-driven reforms in policing and transport administration. Hyderabad: Retired IPS officer N Balasubramanyam, a 1994-batch officer of the Andhra Pradesh cadre, passed away on Friday, after battling with cancer.