
Murder is defined as the unlawful killing of a human being with malice aforethought. The precise legal definition of murder varies by jurisdiction, with some countries, states, and territories mandating life imprisonment for murder, whether or not it is subdivided into degrees. In the United States, most states distinguish between different degrees of murder, with some using the Model Penal Code to define murder and subsequent punishments. The Model Penal Code defines murder as the purposeful or knowing killing of another human being or killing another human being in circumstances showing extreme recklessness. The Pennsylvania Method is a catch-all term for systems of classifying murder by degree, with first-degree murder carrying the death penalty. Second-degree murder typically includes murder with malice aforethought, but not premeditated, and third-degree murder encompasses all other types of murder that do not fall within the first or second-degree categories, such as unintentional murders.
| Characteristics | Values |
|---|---|
| Murder definition | The unlawful killing of a human being with malice |
| Number of degrees | Divided into two or three degrees, depending on the jurisdiction |
| First-degree murder | Premeditated, intentional, or aggravated murder; punishable by death or life imprisonment |
| Second-degree murder | Common law murder; includes murder with malice intent but not premeditated; punishable by imprisonment or life imprisonment |
| Third-degree murder | Unintentional murders or felony murder; punishable by imprisonment or a maximum of 25 years' imprisonment |
| Jurisdictions | Varies by jurisdiction; includes U.S. states, Canada, the U.K., and other common law jurisdictions |
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What You'll Learn

First-degree murder
Murder is defined as the unlawful killing of a human being with malice. The precise legal definition of murder varies by jurisdiction, and most states distinguish between different degrees of murder (first, second, and third).
The prosecution must show both intent and premeditation to prove first-degree murder. This means that the defendant had time to reflect before committing the homicide, which the law tends to see as more blameworthy than killing on impulse. A broad range of circumstances can suggest premeditation, such as if the defendant threatened the victim in advance or if they had an ongoing feud. The prosecution will also likely have a strong case if the defendant waited to ambush the victim or launched an attack when the victim was incapacitated.
In some states, certain offenses are classified as first-degree murder. For example, in New York, "murder for hire" is considered first-degree murder. In Texas, first-degree murder is referred to as "capital murder", which applies to crimes that merit the death penalty.
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Second-degree murder
The intent of the killer is a crucial factor in determining second-degree murder. It encompasses situations where the perpetrator intends to cause serious bodily harm, understanding that death could be a potential outcome. For example, if an individual attacks someone else with a weapon, intending to cause severe injury, and the victim ultimately dies, it could be considered second-degree murder.
Additionally, second-degree murder can involve extreme recklessness or indifference to human life. This means that the perpetrator engages in actions that demonstrate a blatant disregard for the value of human life. For instance, if an individual fires a gun into a crowd without considering the potential fatal consequences, it could be classified as second-degree murder.
The legal definition and penalties for second-degree murder vary across different states. While some states do not use the term "second-degree murder", most recognise the distinction between different degrees of murder. The penalties can range from under a year in prison to life imprisonment, depending on the specific circumstances and the state in which the crime occurred.
It is important to note that second-degree murder does not include felony murder, which is typically classified separately. Felony murder refers to a homicide committed during the commission of certain inherently dangerous felonies, such as burglary, rape, robbery, arson, or kidnapping.
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Third-degree murder
In California, third-degree murder is generally aligned with manslaughter and is characterised by recklessness or inattention. A crime of passion, in which an argument ends with one person dead, constitutes voluntary manslaughter.
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Felony murder
Murder is defined as the unlawful killing of a human being with "malice aforethought". The precise legal definition of murder varies by jurisdiction, with most states distinguishing between different degrees of murder. The felony murder rule is a law in most states that allows anyone accused of committing a violent felony to be charged with murder if the commission of that felony results in the death of someone.
The rule of felony murder is a legal doctrine in some common law jurisdictions that broadens the crime of murder. When someone is killed in the commission of a dangerous or enumerated crime (called a felony in some jurisdictions), the offender and their accomplices or co-conspirators may be found guilty of murder, regardless of their intent to kill. The concept of felony murder originates in the rule of transferred intent, where the malicious intent inherent in the commission of any crime, however trivial, was considered to apply to any consequences of that crime, regardless of intent.
Modern interpretations of the felony murder rule typically require that the offence be inherently dangerous or committed in an obviously dangerous manner. The rule is often justified as a means of deterring dangerous felonies. In the United States, felony murder is considered one of the most serious types of murder, alongside first-degree murder.
There are exceptions to the felony murder rule. Some states do not apply it to co-felons if they did not intend or know that someone was likely to be killed. Additionally, if the person who dies is a co-felon, the rule may not apply. For example, if two people are robbing a store and the store owner kills one of the robbers, the surviving robber would not be charged with the felony murder of their accomplice.
The felony murder rule has been abolished in several jurisdictions, including England and Wales, Northern Ireland, Canada, and the Republic of Ireland. In Canada, it was found to breach the principles of fundamental justice.
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Premeditated murder
Premeditation usually refers to planning the purpose and design to kill prior to the act. Deliberation requires that the act be committed in a cool state of blood and in furtherance of a fixed design to kill. The concepts are intricately related, and the difference between them can be largely semantic. For example, someone premeditates by considering the act, while someone deliberates by considering the act's consequences and deciding to follow through.
Courts focus on the "pre" in premeditation and generally look for evidence that the defendant deliberated and subsequently formed the intent to kill prior to the act of killing. There is no specific formula for determining premeditation, and courts and juries will consider the circumstances of each case. Evidence of premeditation can include a lack of provocation from the victim, the nature and number of wounds, and whether there was an additional lethal attack after the victim was already helpless.
In the United States, the law for murder varies by jurisdiction, and each state has its own criminal code. However, most states require premeditation and many also require deliberation for a conviction of first-degree murder. Second-degree murder, which is less serious, is typically an intentional killing that is impulsive rather than premeditated.
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Frequently asked questions
Murder is when a person unlawfully kills another person. Murder is a category of homicide, and the precise legal definition varies by jurisdiction.
Not all homicide is unlawful, so murder is a specific type of homicide.
Murder is often divided into first, second, and sometimes third degrees. First-degree murder is the most serious and is often punishable by life imprisonment or the death penalty. Second-degree murder typically includes murder with malice aforethought but not premeditated. Third-degree murder, where it exists, encompasses all other types of murder that do not fall within the first or second-degree categories, such as unintentional murders.
First-degree murder includes premeditated killings, where the defendant formed the intent to kill through a process of reasoning or deliberation. It also includes intentional homicide committed during the commission of a violent felony, such as burglary, robbery, arson, kidnapping, or sex crimes.























