Vehicular manslaughter is a criminal offense defined as the unintentional killing (homicide) of another person as a result of criminal negligence or recklessness while operating a motor vehicle—often while the operator is intoxicated by alcohol or drugs, engaged in a high risk activity such as street racing, or committing a misdemeanor or infraction offense (speeding) with ordinary negligence.

Vehicular manslaughter is usually a felony offense and often includes significant jail or prison time as potential punishment. Vehicular 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, vehicular manslaughter is referred to as 'Manslaughter with a Motor Vehicle' or 'Motor Vehicle Homicide.' This offense is defined under Title 17-A, §203 of the Maine Criminal Code as recklessly, or with criminal negligence, causing the death of another person while operating a motor vehicle. This includes situations where the driver is under the influence of intoxicants, such as alcohol or drugs, or is engaging in dangerous driving behaviors like excessive speeding or street racing. Manslaughter with a motor vehicle is considered a Class A or Class B felony in Maine, depending on the circumstances, such as the driver's level of intoxication or prior offenses. The penalties for a Class A felony can include up to 30 years of imprisonment and significant fines, while a Class B felony can result in up to 10 years of imprisonment. Additionally, the state may impose license suspensions or revocations as part of the punishment.