Probably good to remember that USA law has degrees of murder and this explains the difference between 2nd degree and 3rd degree/manslaughter*:
*3rd degree not recognised in all states
First-Degree Murder
First-degree murder usually falls into one of the following two categories:
Premeditated, intentional killings (like stalking someone before murdering them)
Felony murder
In most states, first-degree murder is defined as an unlawful killing that is both willful and premeditated, meaning that it was committed after planning or "lying in wait" for the victim. For example, Dan comes home to find his wife in bed with Victor. Three days later, Dan waits behind a tree near Victor's front door. When Victor comes out of his house, Dan shoots and kills him.
Most states also adhere to a legal concept known as the "felony murder rule," under which a person commits first-degree murder if any death (even an accidental one) results from the commission of certain violent felonies, such as:
Arson;
Burglary;
Kidnapping;
Rape; and
Robbery.
For example, Dan and Connie rob Victor's liquor store, but as they're fleeing, Victor shoots and kills Dan. Under the felony murder rule, Connie can be charged with first-degree murder for Dan's death even though neither of the robbers actually did the killing.
The Elements of First Degree Murder
State laws categorizing murders into first, second and possibly third degrees generally require that first degree murders include three basic elements:
Willfulness;
Deliberation; and
Premeditation.
Federal law and some states also require "malice aforethought" as an element. States, however, differ as to how malice must be shown and whether this is a separate requirement from willful, deliberate and premeditated taking of human life. Most states also enumerate certain kinds of killings as first degree murders without need to prove intent, deliberation and premeditation.
Not all states divide murder into degrees. In some places, the top level murder crime is called by another name, such as "capital murder."
Intent
In terms of willfulness, first degree murderers must have the specific intent to end a human life. This intent does not necessarily have to correspond to the actual victim. A murder in which the killer intends to kill but kills the wrong person or a random person would still constitute first degree murder. Furthermore, under many state laws, killing through action showing a depraved indifference to human life can qualify as murder in the first degree.
Deliberation and Premeditation
Whether a killer acted with the deliberation and premeditation required for first degree murder can only be determined on a case by case basis. The need for deliberation and premeditation does not mean that the perpetrator must contemplate at length or plan far ahead of the murder. Time enough to form the conscious intent to kill and then act on it after enough time for a reasonable person to second guess the decision typically suffices. While this can happen very quickly, deliberation and premeditation must occur before, and not at the same time as, the act of killing.
"Malice Aforethought"
Under many state laws, perpetrators of first degree murder must have acted with malice or "malice aforethought." Malice generally includes an evil disposition or purpose and an indifference to human life. States treat the concept of "malice" differently. Under some laws, malice aforethought essentially means the same thing as acting with a premeditated intent to kill or extreme indifference to human life. Other states require a showing of malice distinct from the willfulness, deliberation and premeditation generally required for first degree murder.
Enumerated First Degree Murders
State laws often categorize specific types of killings as first degree. In these cases, the typical elements of specific intent to kill, deliberation and premeditation may not be required. These often include:
the killing of a child by use of unreasonable force;
certain killings committed in a pattern of domestic abuse;
the murder of law a law enforcement officer, and
homicides occurring in the commission of other crimes such as arson, rape, robbery or other violent crimes.
This list merely illustrates some of the enumerated first degree murders. For a complete list, consult specific state laws.
Many states also categorize certain methods of killing as murder in the first degree. These include intentional poisonings, murders resulting from imprisonment or torture and murders in which the killer "laid in wait" for or ambushed the victim.
Getting Legal Help with Your First Degree Murder Case
In the criminal justice system, first degree murder is one of the most serious charges you could face and it comes with the harshest of penalties. That's why it's important to contact an experienced criminal defense attorney as early as possible so you can learn your rights and protections and develop your legal strategy going forward.
Second-Degree Murder
Second-degree murder is generally either:
An unplanned, intentional killing (reacting in the heat of the moment when angry)
A death caused by a reckless disregard for human life
The Difference Between First and Second-Degree Murder
Putting aside felony murder, the real difference between first and second-degree murder is the intent or mindset the defendant had when they took the action they did.
Third Degree Murder/Manslaughter
Third-degree murder (also called manslaughter) is an unplanned, unintentional killing that is not part of another felony. It can be either:
Involuntary (you fall and push someone off a ledge by accident)
Voluntary (you punch someone and unintentionally kill them)
The Difference Between First-, Second- and Third-Degree Murder
The biggest difference between third-degree murder and the other two is that it is not planned, and it doesn't rise to the level of reckless disregard for human life. In the eyes of the law, a person committing third-degree murder still shows ill will toward someone else by harming them.
Whether someone intends some harm but not death or there is an accident, they can still face manslaughter charges if someone dies because of their actions.
Third-degree murder charges only exist in three states: Pennsylvania, Florida, and Minnesota. Every other state uses the charges of manslaughter.
