Ananya Chakravarty (52), who was an inspector in Research and Analysis Wing (RAW) and was posted as a field officer in the Cabinet Secretariat, was found hanging from a fan while the bodies of his wife Jaishri, son Arnab (17) and daughter Disha (12) bearing blunt injury marks were found in the house which was bolted from inside, police said.
The family, which lived on the second floor of the Type 3 government quarter in Sector IV of Sadiq Nagar area, was last seen on Friday.
Police got a call around 3:47 PM following which a team was rushed to the spot.
"The police team broke open the door and found Chakravarty hanging from a ceiling fan in the drawing room. Bodies of Jaishri and Disha were found in an adjacent bedroom while Arnab's body was found in another room. There were blood stains all over the house and the bodies bore blunt injury marks," the official said.
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Investigators have recovered a blood stained hammer from the house which they suspect was used to kill Jaishri and the two children.
No suicide note has been found in the house. There was no sign of a forced entry in the house, it was closed from inside, police said.
"Prima facie it seems that Chakravarty first killed his family and then committed suicide. We are investigating the case and the exact cause is yet to be ascertained," police said.
The bodies were moved to AIIMS for post-mortem. Police have questioned the maid, the guard and the neighbours in this connection.
As the area was inhabited by senior government officials, interaction among them was occasional.