Hemraj –the servant had stumbled upon a startling fact involving the doctors (possibly all 4 of them-could be like gurgaon doctor kidney racket also) and was blackmailing Mr Rajesh Talwar. The activity/scandal in which the doctors were involved, if exposed would have cost their flourishing professional career.
Mr Rajesh Talwar decides to get rid of Hemraj and hires a Killer who had worked with him and was trustworthy and known to him and Hemraj . The Killer also knew how to kill a person with a single blow on the head
On the fateful night, the killer arrives and Hemraj answers the doorbell. The Killer asks for Mr Talwar and all the three meet and start discussing in Hemraj’s room (proof of 3 glasses). Probably they would have killed Hemraj in his room, but at some moment Aarushi would have seen all three in Hemraj’s room discussing. She would have assumed it as a normal, as she knew the third person (killer).
Later, to see that Aarushi does not overhear the content of discussion, all three would have gone to the terrace, where the killer hit Hemraj on the head when Mr Talwar had engaged him in conversation. Also the activity of cutting the throat is to ensure that the person dies at any cost
Mr Talwar, before retiring to his room leaves the front door unbolted (which the killer is aware of), to provide an alibi for the police that Hemraj’s murder was an activity of outsider.
The killer after some time realizes the grave mistake he has committed by leaving only
