occurrence took place at 7 P.M. Moreover, it is also obvious from the statements of prosecution witnesses that they developed their statements during course of trial and the defence drew their attention towards their previous statements recorded under Section 161 of Cr.P.C. and, therefore, in our view, non-examination of the I.O. is fatal to the prosecution case because the appellant did not get an opportunity to prove the contradictions and the developments made by the prosecution witnesses in course of trial. However, nonexamination of the I.O. has caused serious prejudice to the defence because due to non-examination of the I.O., the real and exact topography of place of occurrence could not be brought on record and the defence could not get an opportunity to show that it was not possible to prosecution witnesses to see the occurrence. No doubt, in cross-examination of prosecution witnesses, the defence tried to bring the real and exact picture of place of occurrence as well as the places from where the so called eye witnesses claimed to have seen the occurrence, yet, in our view, the examination of I.O. was essential because the I.O. is most competent witness to prove the place of occurrence as well as the places from where the prosecution witnesses claimed to have seen the occurrence. Moreover, it is also obvious that except family members of the deceased, not a single independent witness came forward in support of the prosecution case. Therefore, in