The CBI investigation in the death case of actor Sushant Singh Rajput is underway. There are several crucial people who are involved in the case and are pivotal for the CBI probe. The key people who will be integral for the investigative agency to understand if there has been any foul play in Sushant Singh Rajput's death are: Rhea Chakraborty, Sushant's girlfriend, his cook Neeraj, who was present in the house at the time of death, his sisters who had been in constant touch with him, his flatmate Siddharth Pithani, house manager Samuel Miranda, close friend Sandeep Ssingh and filmmaker Mahesh Bhatt.