Murder is the unlawful killing of a human person with malice aforethought. Murder is generally distinguished from other forms of homicide by the elements of malice aforethought and the lack of lawful justification. All jurisdictions, ancient and modern, consider it a most serious crime. Most jurisdictions impose a severe penalty for its commission.Sometimes the term murder is used by laypersons to describe what is really another form of homicide. Murder is a type of homicide, and relatively few homicides are murders in law. Also, police will often call their investigation into a murder a homicide investigation in order not to prejudice any findings of the investigation, possible charges that could be laid, or any conviction of an offender. However, the crime will normally be identified as a murder once there is sufficient evidence to indicate that a murder is the more likely crime than any other.Legal Analysis of MurderTo repeat, at common law murder is defined as the unlawful killing