The contract killer Somnath Tanti was awarded life imprisonment by the Alipore Judges Court.
Judge Siddhartha Kanjilal, delivering the judgement, said it was a rarest of the rare case as the the two little children of the couple Abhik Ghosh and Moushumi Ghosh were deprived of their mother's love at an early age when needed most and the murder was pre-planned.
The judge said that he had no other option but to pass the death sentence against the accused.
The same court had held Ghosh and Tanti guilty two days back.
Ghosh had a dispute with his wife and he had hired a contract killer to murder her. The maid was killed as she was a witness to the incident.