Where an accused raises the defence of self-defence in a murder trial, the burden remains on the State to disprove that defence and does not shift to the accused. At the close of the State case, when considering a discharge application under section 198(3), the court must evaluate only the evidence led by the State (including any warned and cautioned statement) to determine whether it has established a prima facie case. The accused is not required to give evidence to establish self-defence at this stage. Where the State's own evidence, including the accused's cautioned statement, indicates that the accused was unlawfully attacked first and used reasonable means to defend himself, and the State has not led evidence to negative the defence of self-defence, the court is obliged to acquit under section 198(3). The word "shall" in section 198(3) is peremptory and mandatory. For self-defence to succeed under sections 253-254 of the Criminal Law (Codification & Reform) Act, the court must consider whether the means used were reasonable in all circumstances, taking due account of the circumstances in which the accused found himself, including any stress or fear operating on his mind. Where the accused used only his hands to defend against a physical attack involving kicking and punching, and there is no evidence of alternative means available, the means used are reasonable.