The CBI today questioned two key witnesses in Sushant Singh Rajput's death case - a staff member of the actor and his friend Sidharth Pathani - as the investigations by the probe agency in the death case entered the third day. The Supreme Court on Wednesday had ordered the CBI to take over the case. Neeraj, the staff member of the actor found dead at his Mumbai apartment on June 14, was called for the third consecutive day at the office of the Defence Research and Development Organisation (DRDO).