Detective Inspector Scott Beard says the man jailed for her murder would have killed eventually.
He says it was the duty of the defence lawyer to put it forward.
The judge also explained what life imprisonment really means.
"One person has been locked away but are New Zealand women any safer?"
"Strangling someone for five to 10 minutes until they die is not rough sex."
The killer's fate has been revealed by Justice Moore.
Beard was at the forefront of the police investigation into Millane's death.
The British backpacker was murdered in December 2018.
“Your barbaric actions towards my Grace is beyond comprehension.”
Eight extra drop-off locations were added overnight.
The charity has already received hundreds of messages of love and support.
Love Grace gives handbags filled with essentials to women who leave violent situations.
"The message is clear. Get a check-up. It's a simple blood test."
The Tenancy Tribunal has made the order.
He is thought to be the first person charged with breaching name suppression in the case.
He is the first person arrested in relation to the court suppressions.
"The comments made in this video are offensive and would be extremely upsetting."
We don't do a good job in New Zealand of facing the reality of men's violence against women.
Why does Grace Millane's murderer still enjoy privacy when the details of Grace's life have been dragged through the courts?
UK families who have loved ones murdered in the UK or EU countries can apply for a payout
After nearly a year, her family finally got justice.
It says the 'rough sex gone wrong' defence is incredibly concerning.
Police say it's still an offence to name him on social media.
We can all learn a thing or two from the way the parents behaved, writes Mark Longley.
"Many people would say that effectively blackens her character."
"Doing nothing is one option that is not open."
"Grace was our sunshine and she will be missed forever."
The British backpacker came to New Zealand in November, 2018.
After a three week trial, the jury have handed down their verdict.
The jury delivered its verdict on Friday.
The case will be summed up by Justice Simon Moore on Friday.
The defence has finished its closing summary by telling the jury Millane's death was tragic, but not a murder.
The defence has wrapped up its case, with closing statements expected on Thursday.
A high level of alcohol was likely in her blood, a pathologist says.
The murder-accused may enter the witness box.
"Don't let the world change your smile."
Tinder matches, police officers and a pathologist gave evidence.
The jury earlier saw the moment the accused was arrested for murder.
He admits he found the backpacker on the floor of his apartment.
CCTV footage of the man's activity has been shown to the jury.
He allegedly claimed police dogs can only sense bodies buried deeper than four feet.
The jury will watch more of that interview on Wednesday.
He initially lied about what happened on the night of her death.
Jury watched video of police interview with the accused.
She broke down when told she would be questioned again.
Three women spoke of their interactions with the man.
She told court she was worried he might turn up somewhere she may be.
Women the accused previously dated will give evidence.
Details of Google searches, blood splatter and a gravesite were revealed.
Experts have already spoken of blood splatter in an apartment.