Whether HRS § 707-702(2)'s extreme mental or emotional disturbance mitigation retains the common-law heat-of-passion and adequate-provocation limits or instead adopts the broader Model Penal Code approach.
Holding
HRS § 707-702(2) adopts the broader Model Penal Code approach: a murder charge may be mitigated where the defendant acted under an extreme mental or emotional disturbance with a reasonable explanation viewed from the defendant's situation and as the defendant believed the circumstances to be.
Reasoning
The statutory language was not self-defining, and its legislative history did not resolve whether Hawaii intended to preserve the older common-law provocation doctrine. The court therefore examined the history of manslaughter, Hawaii law before the Penal Code, and the Model Penal Code provision from which HRS § 707-702(2) was derived.
Common-law provocation doctrine focused on sudden heat of passion caused by legally adequate provocation, tested largely against an objective reasonable-person standard. That framework limited what could count as provocation, generally required that the victim provoke the defendant, and did not account for an accused's individual mental or physical characteristics.
The Model Penal Code deliberately broadened mitigation beyond the traditional heat-of-passion rule. Extreme mental or emotional disturbance refers to an intense emotional condition producing loss of self-control; it is distinct from insanity, although the inquiry may consider mental abnormalities that bear on the defendant's capacity and perceptions.
The statute requires a combined subjective and objective inquiry. The jury must consider the defendant's internal situation and the external circumstances as the defendant perceived them, even if those perceptions were inaccurate, and then decide whether there was a reasonable explanation for the disturbance from the viewpoint of a person in the defendant's situation.
The court adopted the formulation from People v. Casassa because it gave practical effect to the statutory direction to judge reasonableness from the defendant's situation under circumstances as the defendant believed them to be. Treating pre-Penal Code provocation limits as controlling would render the new statutory language meaningless.