Advocate Abdul Wahab Khan, Mughal's lawyer, is currently making his final arugments before the sessions court here.
Police were trying to shield Avik and they framed up his client, he said.
On the day of the incident, Avik and the victim were together till 5 am in the morning and therefore the onus of explaining the injuries on her body fell on Avik, advocate Khan argued.
Avik Sengupta died in November last year.
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Khan will continue his argument tomorrow.
Sajjad Mughal (22), a native of Jammu and Kashmir who worked as a security guard at Himalayan Heights in suburban Wadala, is accused of killing Pallavi, a 25 year-old lawyer, at her flat in the building on August 9, 2012.
Pallavi lived with Avik but he was at work when the murder took place, as per the prosecution.
Police claim Mughal killed her after she resisted his advances while she was alone.