Gurugram, Sept. 30 -- A 33-year-old software engineer allegedly murdered his 33-year-old wife, also a techie at a multinational IT company, before dying by suicide inside their apartment in Gurugram's Sector 37D, police said on Monday. The crime - expected to have taken place between 3pm and 3.30pm on Sunday in Tower-7 of the Millennia-1 society - came to light hours later, when the husband sent a video to a WhatsApp group of his friends, confessing that he had killed his wife and intended to end his life. One of the friends, a Bengaluru resident, alerted Gurugram Police after seeing the message, investigators privy to the case said. Police said the couple had been married for three years, had no children, and had been living in the city for several years. The husband hailed from Prayagraj, Uttar Pradesh, while his wife was from Asansol, West Bengal. According to officials, the friend who received the video only knew the name of the housing society. He searched for the number of the station house officer of Sector 10 police station and reported the incident. Gurugram Police spokesperson Sandeep Turan said the information reached them around 4pm. A team was rushed to the spot, where they found the flat locked from inside. The door was broken open, revealing the couple dead inside one of the rooms. "The woman's body was lying on the floor with visible injury marks on her neck, suggesting she had been throttled. The husband was found hanging in the same room," said Turan. Investigators believe a heated argument may have triggered the violence, however, family members of the couple told police they were unaware of any marital dispute. A senior officer privy to the probe said, "In the video sent to the group chat, the husband admitted to murdering his wife, apologised, and then said he was going to kill himself. By the time his friend saw the video and called the police, it was already too late." Neighbours told police the couple largely kept to themselves, rarely interacted with others in the society, and were never heard quarrelling....