Summary:
After two days of the murder, the police collected footages of 20 CCTV cameras including one from a Kolkata Municipal Corporation building. According to a senior police official, investigators suspected that the crime has been committed by someone who is not professional killers. Also, their prime suspects were the labourers, who had worked in that area, the house of the victim and with the tenants. Alam hid himself inside the house and when Swapna came back, he strangled her from behind and killed her. Alam went inside and asked Dilip where he had kept the money and jewellery in the house..