Vyapam scam whistleblower Dr Anand Rai has issued a defamation notice to BJP spokesman Sambit Patra for allegedly calling him 'a murderer' during a television news debate telecast in 2015.

Dr Rai, in a notice issued on January 21 through his advocate Abhinav Dhanodkar, has asked Patra to publish an unqualified apology prominently in front of the general public through newspaper within 15 days from its receipt.