In a murder prosecution based on circumstantial evidence, the inference that the accused committed the murder must be consistent with all proved facts and those facts must exclude every reasonable inference except that the accused is guilty (applying Rex v Blom). Where an accused is identified by a distinctive nickname and family name he gave to witnesses, is armed with deadly weapons, becomes violent when rejected, is the last person seen with the deceased who is found dead moments later with fatal stab wounds consistent with the accused's weapon, and the accused attempts to destroy evidence and gives incredible testimony, the inference of guilt is established beyond reasonable doubt. Intention to kill is established on a subjective test (section 13 of the Criminal Law (Codification and Reform) Act) where the force used demonstrates the accused intended to produce the fatal consequences - here, stabbing with sufficient force to penetrate the heart, fracture a rib, and cause massive internal bleeding.