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 Connecticut, vehicular manslaughter is addressed under the state's penal code as 'manslaughter in the second degree with a motor vehicle' or 'misconduct with a motor vehicle.' These offenses occur when a person operates a motor vehicle under the influence of alcohol or drugs, or in a negligent manner, resulting in the death of another person. Manslaughter in the second degree with a motor vehicle is considered a Class C felony, which may result in a prison sentence of up to 10 years, a fine of up to $10,000, or both. Misconduct with a motor vehicle is a Class D felony, potentially leading to a prison sentence of up to 5 years, a fine of up to $5,000, or both. Additionally, Connecticut law requires the revocation of the driver's license of anyone convicted of manslaughter in the second degree with a motor vehicle. The specific statutes detailing these offenses are found in the Connecticut General Statutes under sections 53a-56b and 53a-57 respectively.