The mystery surrounding the death of Rohit Shekhar Tiwari, the son of former chief minister of Uttar Pradesh and Uttarakhand, late ND Tiwari, seems to deepen with each passing day. According to the post-mortem examination report, he died an ‘unnatural death’ due to “asphyxia” as he was strangled and smothered to death. Now that the Crime Branch has been handed over the investigation of the case, some more murkier details have emerged even as Rohit’s wife Apoorva Shukla Tiwari and his cousin Pappu are yet to be questioned.