But in 2009 an emotionally charged Parliament did away with that centuries-old defence.
The emotion was understandable. Killers of gay men had used the "gay panic defence" to reduce a murder charge to manslaughter. Their defence was that the victim had sexually advanced upon them and that they had "lost it". The partial defence of provocation seemed to discriminate against gay victims.
The provocation defence came into wider public focus when Clayton Weatherston claimed Sophie Elliott had provoked him to slay her viciously. It was sickening that a brutal murderer of a woman could "re-victimise" her in death.
His defence failed but people were appalled that such a defence was available to him.
Sophie's Mum said: "We've thought about it a lot over the last few weeks — probably there's not very many murders where provocation is justified however, in our society it's never justified — thou shalt not kill and that's the bottom line."
It was hard in the face of such cases to defend the defence. The following year all parties bar Act voted to scrap the provocation defence, to much cheering. The naysayers, of which I was one, were jeered at.
But I keep replaying what any one of us would have done in Murray's shoes that awful night and that, surely, with hundreds of years of judicial wisdom behind him, he should have had the opportunity to argue he had been provoked beyond all reason.