A woman, who brought a bloody end to an Auckland nail and eyelash party by attacking another guest with a knife, killed because she had just been humiliated, prosecutors say.
Anna Eiao Browne, 37, is accused of stabbing Carly Stewart in a Te Atatu home last October and is standing trial in the High Court at Auckland charged with her murder. She has pleaded not guilty.
Ms Stewart died from uncontrollable blood loss 15 minutes after paramedics arrived.
Closing the Crown case on Tuesday, prosecutor Nick Webby said Browne became increasingly agitated during the party.
After she abused guests and got into scuffles, Ms Stewart restrained her.
Witnesses described how Ms Stewart dominated, intimidated and made Browne scared, telling her "You f*** disrespectful b***, my nieces are f*** here".
Browne's disproportionate response was to grab a knife and stab Ms Stewart, Mr Webby said.
This made her guilty of murder under both its legal definitions, he said.
That is, she not only intended to kill when she plunged the knife 11cm into Ms Stewart's face, but she was reckless to the dangers of her actions.
Mr Webby described how, out of all the utensils in the kitchen, Browne chose the largest knife before hiding it behind her back to maintain the element of surprise and then striking at Ms Stewart's head - a vulnerable target.
"It was a carefully directed blow," he said.
"Can you really infer any other intention but an intention to kill."
But defence lawyer Marie Dyhrberg said Browne's blow was not planned or premeditated and dealt in the middle of a party filled with fun, music and witnesses.
This showed Browne never intended to kill, she said.
Browne also stayed at the scene after she stabbed Ms Stewart - another unusual action for an alleged murderer, Ms Dyhrberg said.
Instead, Browne was heavily intoxicated and possibly on drugs, helping to explain why she acted in an extraordinary and uncharacteristic way, she said.
Ms Dyhrberg also criticised a police officer for not keeping the contents of a cup Browne had been drinking from so it could be tested for the possibility it had been spiked with drugs.
Mr Webby agreed Browne's state of mind was important to the trial, saying medical experts had testified she suffered from anti-social and attention deficit disorders.
He said even the defence's medical expert had said these disorders together with alcohol consumption had a direct relationship to Browne's violence and emotional responses.
These responses were "often out of all proportion to the triggering event", he said.
Browne's defence lawyers are due to give their closing argument later on Tuesday.