An 86-year-old man was killed by unidentified robbers on Monday night when he was alone at his east Patel Nagar house.
The victim, Om Prakash Sharma, was strangled and then stabbed on his neck. The robbers reportedly fled with cash and jewellery worth Rs 7 lakh.
According to the police, there was no forced entry.
"My wife, who works with a private firm, was in office. I had gone to Safdarjung Enclave for some work, while my children were away for tuition classes," said Sharma's son Kamal Jaitley, who runs an advertising agency called Vivid India.
Sharma's daughter Poonam, who lives in nearby Rajendra Park, said that he was talking to her on the phone at 7.15pm when someone knocked on the door. According to her, Sharma told her to hold while he went to answer the door.
But when he didn't return after even 10 minutes, Poonam disconnected the line and called back. However, repeated calls to the landline and Sharma's mobile phone didn't yield any response, so Poonam called her brother and then went to Patel Nagar herself.
Jaitley, too, sent one of his employees to check on Sharma.
Once there, Poonam found the door locked and she got a carpenter to open the door.
"She found him bleeding profusely in the bedroom. They then took him to Sir Ganga Ram Hospital where the doctors declared him dead," Jaitley said.
"Kamal's wife had asked the servant Chotu to accompany their children. The family driver took them to Alaknanda for tuition. It means someone knew that Sharma was alone in the house," said a senior police officer requesting anonymity.
Sharma was a retired official from the ministry of defence and Jaitley said Sharma was aware of the possible threat to senior citizens living alone so there was no chance he could have opened the door.
"The robbers broke open only two out of 15 lockers. Poonam reached the house at 7.45pm, which means it all happened within 30 minutes. A laptop is also missing," said the officer.
A case of robbery and murder was registered at Ranjit Nagar police station and further investigations were on.