All 3 Uses

manslaughter
in
An Innocent Client
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What Angel had described to me was voluntary manslaughter, at worst.†
p. 307.7

voluntary manslaughter = not planning to kill a person, but then intentionally killing in the heat of passion
If she tells the truth, I can argue self-defense or voluntary manslaughter because he sodomized her:' "What's the worst case if you go that way?"†
p. 318.2
If they go with voluntary manslaughter, she'd be eligible for probation, but I doubt if Judge Green would grant it.†
p. 318.4 *

Definitions:

(1) (manslaughter)
unintentional killing of a person

Manslaughter can be involuntary (as when a drunk driver accidentally kills someone), or voluntary (as when there was no plan to kill someone, but then the person kills in the heat of passion).
(2) (meaning too rare to warrant focus)