On the day DK Ravikumar was found hanging at his Bangalore residence, the 36-year-old IAS officer had reportedly called a female 2009 batchmate at least 44 times within an hour, an investigation into his call details has revealed.

According to an Indian Express report, the woman IAS officer - who is married and has a child - has been asked by the state's Criminal Investigation Department to join the probe.

The newspaper cited sources saying that the IAS officer used to frequently make Facebook posts highlighting the work of the woman IAS officer. Ravikumar was married to Congress leader Hanumantharayappa's daughter Kusuma four years ago, the report said.
 
The IAS officer, considered to be an honest and upright administrator, also reportedly sent text messages to the batchmate prior to his death. Karnataka Chief Minister Siddaramaiah had also talked about the 44 calls made to a woman IAS officer in his interaction with reporters after the death.

The opposition BJP and JD-S, which has been demanding a CBI probe into the death, said the revelation about calls made is reason to conduct a central inquiry into the incident. "What is the intent of revealing this information? How can the state CID investigate when this information has already been revealed," JDS leader H D Kumaraswamy had said.

Ignoring a huge clamour and even a call from Congress president Sonia Gandhi, a defiant Congress government in Karnataka on Thursday declined to accept Home Minister Rajnath Singh's offer to hold a CBI inquiry into the death of the officer.