As the Central Bureau Of Investigation (CBI) takes up the investigation of the Sushant Singh Rajput death case, the prime suspect in the case remains the actor's girlfriend, Rhea Chakraborty, who was charged with abetment of suicide in Sushant Singh Rajput's father, KK Singh's FIR in Patna's Rajiv Nagar Police Station. Former CBI Director AP Singh, however, feels it is unlikely that Rhea will be arrested for these charges.