A 51-year-old blind man and his wife were stabbed to death allegedly by some unidentified persons in Dwarka's Mohan Garden area on Saturday, police said.
The deceased have been identified as Hari Ballabh and Shanti Singh (47), both native of Bihar, and they are survived by their 22-year-old son and a 27-year-old daughter they said.
Bhallabh worked as a music teacher with a private school in Kanjhawala and his wife was a homemaker.
According to police, the bodies bearing multiple stab injuries were found in their house Saturday evening, police said.
The couple's daughter returned home in the evening to find the main door of the house was open. Upon entering, she saw her parents were lying in a pool of blood, with multiple injuries on their neck, abdomen and chest; following which she called the police, an official said.
Police said no sign of forceful entry was detected and the house has not been ransacked. The primary investigation into the case suggests personal enmity as the motive behind the double murder.
The bodies have been sent for post-mortem and CCTV footage are being checked, they said.