KATHMANDU: A 19-year-old teenager collapsed to death in Chandragiri Municipality of Kathmandu district on Thursday. The deceased has been identified as Karuna Dani of Chandragiri-2. It has been learnt that Dani had collapsed while she had gone to the toilet and was taken to Kalanki-based Sahid Memorial Hospital. She later succumbed to the unconsciousness while undergoing treatment. Police said they are investigating into the case.