REPUBLIC v ZINITEGE    Criminal law and procedure—Murder—Self-defence—Section 37 of Act 29 requiring harm used in self-defence to be reasonably necessary in circumstances—Existence of bad blood between appellant and deceased, his nephew—Parties separated during a quarrel—Deceased later ambushing appellant and attacking him three times with sticks—Appellant seizing stick from deceased during third attack and hitting him on head with it—Deceased dying from injuries—Autopsy report showing that blow killing deceased very severe—Whether defence of self-defence available to appellant—Criminal Code, 1960 (Act 29), s 37.