The Delhi Police are now offering Rs 50,000 to anyone who can give information on Jagat, the main suspect in the murder of 82-year-old Bimla Shah in Jungpura extension.
Jagat, who was working as a domestic help, was hired nearly a month ago.
"Since he was not verified, we are finding it difficult to identify him. We traced the man through whom he was hired and got Jagat's photograph. We have also intimated the Nepal police as Jagat used to live there," said a senior police officer.
Shah's body was found in the bathroom of her Jangpura residence with the hands and face tied on October 31.
Police had also recovered a pillow in the bathroom which suggested that she was smothered to death.
Shah's only son Bharat, who is an engineering graduate from IIT Roorkee, had been away to Singapore with his wife since October 17.
The Shah family has been living on second floor of K-7 Jungpura extension for the past 22 years.