Involuntary manslaughter is a criminal offense defined as the unintentional killing (homicide) of another person as a result of criminal negligence, recklessness, or during the commission of a misdemeanor (driving while intoxicated), infraction (speeding), or a felony crime that was not inherently dangerous. Involuntary manslaughter is usually a felony offense and often includes significant jail or prison time as potential punishment.

Involuntary manslaughter laws vary from state to state and are generally located in a state’s statutes—often in the penal or criminal code.

In Maine, involuntary manslaughter is referred to as 'Manslaughter' under Title 17-A, Section 203 of the Maine Criminal Code. It is defined as the unlawful killing of another person without malice aforethought, either express or implied. This can occur when a person recklessly, or with criminal negligence, causes the death of another person, or when a death results from the commission of a misdemeanor or a non-dangerous felony. Manslaughter in Maine is a Class A crime, which is a serious offense that can result in a significant prison sentence. The specific circumstances of the incident, such as the level of negligence or recklessness involved, will influence the severity of the charges and the potential penalties upon conviction. It is important for individuals facing such charges to seek the guidance of an attorney who is experienced in criminal law in Maine to navigate the complexities of the case.