Murder is the unlawful killing of a human being under the King's peace, in any country of the realm, with malice aforethought, express or implied
Voluntary Manslaughter occurs when murder is reduced to manslaughter due to loss of control (LOC) or diminished responsibility (DR), reflecting that the defendant is less blameworthy and avoids a mandatory life sentence for murder
Loss of Control (LOC) is a partial defence where the defendant causes the death but at the time lost self-control and reacted as a "normal person" might have done in the defendant's situation
LOC requires a "loss of self-control" with a "qualifying trigger" where a person of the defendant's sex and age with a normal degree of tolerance and self-restraint may have reacted in a similar way (normal person test)
Qualifying triggers for LOC can be fear of serious violence (fear trigger) or things said or done causing a justifiable sense of being seriously wronged (anger trigger)
Limitations on qualifying triggers for LOC include sexual infidelity/affair and revenge, where revenge excludes situations where the defendant acted in a considered desire for revenge
Diminished Responsibility (DR) under s.2 Homicide Act 1957 amended by s.52 CJA 2009 reduces murder to manslaughter if an abnormality of mental functioning (AMF) arose