The forfeiture rule applies on a case-by-case basis to manslaughter and analogous offences such as defensive homicide; it is not absolute and inflexible as stated by the majority in Troja v Troja. At minimum, the rule applies where the killing involved deliberate, intentional and unlawful violence with no legal justification. It does not apply where the killer was unaware of the nature of their acts or where rational judgment was precluded (e.g., insanity). The rule is a rule of law, not equity, and courts have no inherent discretion to grant relief from its operation — legislative reform is required for that. The question whether the rule extends to manslaughter by criminal negligence or culpable driving remains open.
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