Murder is the deliberate, intentional killing of another person. Manslaughter is unlawful killing without that deliberate intent, for example through negligence or in the heat of the moment. The memory hook is intent: murder means it was meant, manslaughter means it was not.
The core difference
Murder requires deliberate intent to kill, while manslaughter is unlawful killing without that premeditated intent.
- murder — the crime of deliberately killing another person: He was arrested and charged with murder.
- manslaughter — the unlawful killing of a person without the deliberate intent required for murder, for example through negligence or in the heat of the moment: He was convicted of manslaughter rather than murder because there was no premeditation.
How to tell them apart
The clearest memory hook is premeditation. Murder is planned, or at least intended, killing. Manslaughter covers deaths that were unlawful but not planned, such as a fatal crash caused by a negligent driver, or a killing committed in a sudden heat-of-the-moment loss of control.
The mix-up matters most in news reporting and court coverage, where the charge itself carries meaning: a manslaughter charge signals that intent was absent or unproven, while a murder charge signals that prosecutors believe the killing was deliberate.
