Police said they got their first clue on journalist Chandrika Rais alleged involvement in the abduction of SDO Hemant Jharias son Anant from the call detail records of the phones used by the kidnappers who had made the ransom calls.
The kidnappers were found to be in touch with some locals using phones purchased by Rai from a local shop.
On February 17,Rai attended a press conference called by the local police to announce Anants safe return. Though there were different versions of what transpired at the conference,Rai was the last person to leave the venue.
Rai,his wife,and two teenaged children were killed at his office-cum-residence that same night. Their house had been ransacked and the mobile phones used by Rai and his wife were missing.
Police said Rai had taken a food parcel from a dhaba late on the day he was killed,probably because he was expecting his accomplices at his office.
The police had maintained from the beginning that Rai knew the killers as they had made a friendly entry.
His family members were killed to destroy evidence,police said.
DGP S K Rout,who visited the crime scene,is set to address a press conference in Bhopal on Friday.