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6. Site plan was prepared and the body of the deceased was identified by his mother and post mortem was conducted by PW-15. As per the post mortem report dated 18th July, 2012, the cause of death was shock as a result of ante mortem injury to the head produced by blunt force impact and there were four external injuries on the body. Thereafter, PW-19 and his team showed the CCTV footage to PW-2 Shaukat, the brother of the deceased, and he identified that the person who had pushed the deceased from the second floor was the appellant. The CCTV footage obtained from the Control Room of Karkardooma Court was preserved and upon an application to the court, the hard disk of the CCTV footage was also seized. The expert agency for the CCTV (Paramid Cyber Security) gave details of the hash value which is exhibited as Ex.PW-12/A.
9. PW-18 the Senior Scientific Officer and Head of the Department of Computer Forensic Division, CFSL testified that he had examined the hard disk of the CCTV footage and opined that the hard disk was not tampered. He had also cloned the hard disc and prepared a DVD from which snap-shots were taken from 09:30 to 10:30 hours. As regards the CCTV, testimonies of PW-10 Constable Yatender who saw the incident from the CCTV camera no.82 at about 10:00 a.m. and PW-13 Ashwani, the official from the CCTV company who retrieved the footage of camera no.82 confirmed that the police officials had sealed the same hard disk which was taken out from the CPU from the CCTV Control Room in his presence. Also relevant in this regard is the testimony of PW-12 the Forensic Investigator who was brought to the CCTV Control Room by the I.O. and took out the hard disk from the CPU and prepared the two mirror copies of the hard disc and generated the hash value of the original hard disk. He testified that there was no tampering in the process of taking out the hard disk from the CPU.