Penal Code, 1860–Secs. 302 & 201–Conviction–Circumstantial evidence –Establishment–Prosecution failed to establish the recovery of weapon at the instance of appellant–Evidence of PW 7 and opinion of doctor who conducted the post mortem of body creates doubt on the version of prosecution–Prosecution failed to give the explanation in regard to large number of glass pieces at the place where the body of deceased was found–Circumstance of last seen is a very weak circumstance–chain of circumstances is not complete–Conviction cannot be sustained.