A class 12th student committed suicide in Bakhtawarpur area in Rohini after being allegedly stalked and harassed by a neighbour.
Police received the complaint yesterday.
The accused, 20-year-old Mayank, would often stalk the girl and upon objecting, the accused threatened to kill her parents.
In a suicide note, the girl claimed that she was taking the extreme step owing to the harassment by a neighbour, police said.
Police said they have registered a case and efforts are being made to arrest the 20-year-old man, who was allegedly stalking her.