Murder

The accepted definition of murder is...

The unlawful killing of a reasonable person in being under the Queen's peace with malice aforethought 

Unlawful 

There may be many lawful reasons for death. The homicide can be made lawful by using a compete defence such as self-defence. 

Killing

Killing is the accelaration of death i.e.  bringing forward the time of their death from the time it should have been (R v Adams)

The killing can occur through a positive act or an omission- 5 Omissions:

• Official position (Dytham)
• Relationship (Gibbins and Procter)
• Duty taken on voluntarily (Stone and…