Shimla: Bharatiya Janata Party (BJP) unit in Himachal on Friday has intensified its demand for a Central Bureau of Investigation (CBI) probe into the suspicious death of Vimal Negi, Chief Engineer of Himachal Pradesh Power Corporation Limited (HPPCL). On Friday, a BJP delegation, led by Leader of Opposition Jai Ram Thakur, met Governor Shiv Pratap.