"Interrogator": "So, the man was dead. So, what with what, like, how did he die?", 
"Interrogee": "It was actually not shown how he died, but the usual way that every victim of that serial killer dies is through poison, and the same manner Ritu Raj died. Rishi Raj died, and it was when they faced their conversation when Vaibhav Jain revealed that he is the serial killer, Raj placed his hand at his neck, and it seems like he was choking. He was unable to breathe, and it was affecting somewhere or something. Then his eyes turned red, and there was some foamy leather coming from his mouth, then he died."