Hemraj tells Aarushi that their parents are into couple swapping and that is y they used to lock her room every night. Aarushi doesn't believe it, so Hemraj asks Krishna to get Khukri which he does so to break open the lock of Aarushi's room... If you read the police comments initially, they said on that night her door wasn't locked... Aarushi gets to know abt whats happening and questions their parents.... Dr Talwar gets furious, takes the same khukri and kills her... Meanwhile the Durranis and Talwars catch hemraj and also kill him
