Late actor Sushant Singh Rajput's family's lawyer Vikas Singh has said Sushant's friend and flatmate Siddharth Pithani is a "very intelligent criminal". "What he did was, until FIR was registered by family he was talking to them regularly and trying to help them," Vikas said. "The moment FIR was registered, he started helping Rhea Chakraborty," he added.