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 Arizona, vehicular manslaughter is referred to as 'Manslaughter' under Arizona Revised Statutes § 13-1103. This statute defines manslaughter as recklessly causing the death of another person, which can include the unintentional killing of someone through the operation of a vehicle. This may occur in situations such as driving under the influence of alcohol or drugs, excessive speeding, or engaging in reckless driving behaviors. Manslaughter is considered a Class 2 felony in Arizona, and the penalties can be severe, including lengthy prison sentences. The specific circumstances of the incident, such as the driver's level of impairment or recklessness, will influence the severity of the charges and the potential punishment. It is important to note that Arizona law also recognizes 'Negligent Homicide' under Arizona Revised Statutes § 13-1102, which is a lesser offense involving criminal negligence rather than recklessness, and is classified as a Class 4 felony.