KOLKATA: A Class XII girl of a Sonarpur school committed suicide , apparently after a video chat on Facebook with her boyfriend. Mousumi Mistry was found hanging in a room at her house in Sonarpur on Sunday morning.Her father, Dipak Mistry, blamed the boyfriend for the death. He said her mobile was in the room she was found in. “Going through it, I am certain my daughter was having a long chat via social media with a youth from Sonarpur,” he said. “We had earlier come to know that she had become close to this youth. I am certain she was chatting with the youth and I am also sure that he is responsible for her death.”“Since Saturday afternoon, my daughter had been receiving several phone calls,” said mother Sampa Mistry. “I also noticed she had become depressed after speaking on the phone and that she left the house. She returned home only in the evening, as I was about to leave home for some work. I did not question her then but merely told her to have some food. When I called my husband from work around 10pm, he told me Mousumi had again been out to attend a function at a local club and had just returned home and entered her room.” Sampa works a 12-hour night shift as an ayah.On Sunday morning, Mousumi did not open her door, said Dipak.“I assumed she was asleep and would wake up late, as it was a Sunday. When her door remained closed till 11am, I called her mobile but got no answer. I then tried knocking repeatedly, but she still did not respond. I then looked through her window and was shocked to find her hanging,” he said. The police were summoned, who brought the body down and sent it for autopsy.On Monday morning, Dipak and Sampa went to Sonarpur police station and handed the cops two phones that Mousumi used. They also lodged a complaint naming the youth, with whom they claimed, their daughter was in a relationship, alleging he was responsible for her death.“We have started an investigation and seized the two mobiles given to us by the victim’s parents. We will go through the mobiles and hope they will give us some clues,” said additional SP, Baruipur, Saikat Ghosh.