New Delhi, April 19 -- Rohit Shekhar Tiwari, son of late Uttarakhand chief minister ND Tiwari, died of "asphyxia" as he was strangulated and smothered, according to autopsy report.

Following the postmortem at AIIMS here, police on Thursday registered a case of murder and transferred it to the Crime Branch for investigation, a senior officer said.

The autopsy was conducted by a medical board comprising five senior doctors of the All India Institute of Medical Sciences (AIIMS).

"The medical board unanimously concluded that the cause of death in this case is asphyxia as a result of strangulation and smothering. It is a sudden unnatural death, placed in the category of homicide," the head of the AIIMS' forensic department, Dr Sudhir Gupta,...