What is Voluntary Manslaughter?

Legal Definition
Voluntary manslaughter is the killing of a human being in which the offender had no prior intent to kill and acted during "the heat of passion", under circumstances that would cause a reasonable person to become emotionally or mentally disturbed. Voluntary manslaughter is one of two main types of manslaughter, the other being involuntary manslaughter.
-- Wikipedia
Legal Definition
Killing another person without deliberation, premeditation, or malice aforethought. Committed while in the heat of passion, or else, as a result of some kind of adequate provocation.
Legal Definition
In criminal law. Manslaughter committed voluntarily upon a sudden heat of the passions; as if, upon a sudden quarrel, two persons fight, and one of them kills the other. 4 Bl. Comm. 190, 191.
-- Black's Law Dictionary
Legal Definition
Intentional homicide without malice. See 96 Ga. 653, 23 S. E. 827.
-- Ballentine's Law Dictionary