The four-member team of Bihar Police reached Mumbai on Tuesday to help with the investigation being carried out to determine the reason behind Sushant Singh Rajput's suicide. An FIR was registered at Patna's Rajiv Nagar Police Station after Sushant Singh Rajput's father, KK Singh, filed a complaint against Rhea Chakraborty. In his complaint, KK Singh alleged that Rhea had instigated Sushant to commit suicide and had cut him off from his family.