This document provides a summary of a lecture on fatal offences, including murder and manslaughter. It recaps the elements of a crime as actus reus (guilty act) and mens rea (guilty mind). It then defines fatal offences as those involving killing the victim, specifically murder and manslaughter. Murder requires an unlawful killing with malice aforethought, defined as intention to kill or cause grievous bodily harm. Manslaughter is unlawful killing without malice aforethought. Voluntary manslaughter is a partial defense to murder where there is provocation or diminished responsibility. Involuntary manslaughter involves death caused without intent.