He was 68.
Mishra passed away at 5:40 AM. He was battling with prostate cancer over the past one year. He was admitted to AIIMS on December 10, his family said.
Mishra, who authored books like 'Aaj Bhi Khare Hai Talab' and 'Rajasthan Ki Rajat Boonde', was a recipient of Indira Gandhi Paryavaran Puraskar.
He is survived by wife and son.