The husband-wife duo Noor Mohamad (32) and Afsana (30) were arrested yesterday from Gazipur bus depot when they were attempting to escape to Basti after taking a bus from Anand Vihar Bus terminus, a senior police official said.
They were nabbed following the recovery of Mohammed's brother Shehryar's body with its throat slit was found following a complaint from the landlord about foul smell emanating from the premises on Saturday last, the official said.
According to police, the victim had an illicit relationship with his sister-in-law leading to tension between the two bothers.
During interrogation, Afsana confessed that as Shehryar wanted to continue with the relationship even after she ended the affair, the husband-wife duo planned to kill him", said P Karunakarn, DCP North-West district.
Afsana and Mohammad also confessed that they slit his throat after smothering him and put the body inside a trunk and escaped before dawn, the official said.
They threw their blood stained clothes, mobile phone of the deceased and knife into the bushes near the Yamuna canal in Pitampura, he added.