In the USA murder is broken down into different degrees however in English law it is not, it is murder which follows with a mandatory life sentence. There can be various different types of manslaughter dependent on the situation and very different aspects involved with the crime itself. Unlawful killing is when and a person of sound mind and of the age of discretion can commit the actus Reus of murder by unlawfully killing another person. This means that the defendant in a murder case must be legally responsible for his actions and cannot be classed as insane, cannot have committed the crime under diminished responsibility and has to be a person and not a corporation