The victim has been identified as Simran, an executive working in an MNC in Noida. She had got married two years back.
Last evening, around 6.15 pm, Simran boarded a metro from Noida to visit her aunt's place. Simran's cousin had given birth to a baby and he had told her aunt about her coming to give a surprise.
At 7.30 PM, she de-boarded at Karol Bagh metro station. When she was near her aunt's house, the suspect who was following her, accosted her. He stabbed her once in the arm and then in the chest, said police.
Police have launched a manhunt to nab the accused. However, no breakthrough has been achieved in the case.
"It is an unfortunate incident. We have registered a case and taken up investigation. We are sure of working out the case soon," said Delhi Police Commissioner B S Bassi.