The incident had taken place on the night of December 5, 2014 when the victim, a finance executive working in Gurgaon, was returning home in Inderlok in Central Delhi.
The accused was arrested from Timarpur and during interrogation he told the police that he was in intoxicated state at one Usha's residence when Nishti, the victim, had visited her.
Police suspect that the deaths were part of a suicide pact, carried out in accordance with a religious practice, as handwritten notes found on the spot indicated.
According to the police, the prospective buyers may have made a call over online platforms and hence it is becoming increasingly difficult to track the call records.
