Two women killed in different states, hours apart.

A young woman has been remembered as a "beautiful girl" after her body was discovered at a home in Melbourne's northeast.

The woman, identified as 23-year-old Celeste Manno, was found dead at a property on Umbria Road, Mernda about 4.10am on Monday.

A 35-year-old man, believed to be known to Ms Manno, was arrested and taken to hospital after suffering non-life-threatening injuries.

He was placed under police guard in hospital and a homicide investigation initiated.

Detectives were still at the Mernda house late Monday afternoon as mourners laid bouquets of flowers outside on the nature strip.

Blood and evidence markers were visible on a side tin fence.

At 1:40am on Monday police were called to a home in Balga, WA where they found a 39-year-old woman seriously injured. She died in hospital.

Woman fronts court charged over alleged Balga murder of relative. 🔒 https://t.co/p2NXk1xurq #wanews pic.twitter.com/Z8TOdtvlPU

— The West Australian (@westaustralian)

A second woman was taken into custody and charged with murder.

According to Destroy the Joint, these two deaths bring the total number of women killed due to violence in 2020, to 45.

Anyone needing support is urged to contact 1800 RESPECT (1800 737 732) or Lifeline on 13 11 14.

Borders shut and restrictions introduced to stamp out SA virus spread.

Extra support is at hand and state border closures are re-emerging as South Australia enters a critical phase of containing its coronavirus outbreak.

Prime Minister Scott Morrison remains positive Australia will be open by Christmas, as Queensland, Western Australia, the Northern Territory and Tasmania announced broad travel restrictions on Adelaide arrivals.

From midnight TONIGHT, sweeping changes to South Australia's COVID-19 restrictions will come into effect. Full breakdown: https://t.co/Gr0NUaDBuR The latest on the outbreak, 5.00pm and 6.00pm on #9News pic.twitter.com/BwtZOnitnp

— 9News Adelaide (@9NewsAdel)

South Australia's cluster is at 17, with 15 of those in the same family.

The number doesn't include three children who have tested negative but are being treated as cases because they have symptoms and their parents tested positive.

As of midnight last night gyms, recreational and play centres have been closed, community sport and training cancelled, and caps installed on numbers in hospitality venues, churches and private gatherings.

Victoria - marking 17 days without new infections or deaths - and NSW have increased screening for Adelaide arrivals, while WA has re-introduced its hard border for the state.

Anyone who has recently been in SA will be blocked from entering WA unless they can secure an exemption.

Swimmer Shayna Jack's ban cut to two years

Australian swimmer Shayna Jack has had a four-year doping suspension halved after it was found she did not intentionally use a banned substance.

The Court of Arbitration for Sport (CAS) ruled on Monday that Jack serve a two-year ban after returning a positive sample to Ligandrol.

Jack was originally suspended for a maximum four years despite pleading her innocence during an Australian Sports Anti-Doping Authority hearing.

The 22-year-old returned a positive sample in an out-of-competition test at an Australian team training camp in June 2019 as she prepared for the world championships in South Korea.

In handing down its finding, CAS said Jack did not knowingly take Ligandrol.

Ligandrol is supposed to add muscle mass without the side-effects of steroids.

Jack's ban will be backdated to the start of her provisional suspension from July, 2019 and she can return to competition in July next year.

"I walk a little taller tonight with the fact that this ordeal is finally over.

"I am returning to swimming – the sport that I have loved all my life and the sport that I will cherish just that little bit more ongoing," she wrote on social media.

Phoebe Burgess calls NRL system 'toxic'.

Sam Burgess' former wife leaked her police statement to a national newspaper to combat the "toxic" covering-up culture of the NRL, a court has heard.

Phoebe Burgess appeared before the Moss Vale Local Court on Monday after allegations her ex-husband threatened her father in his NSW Southern Highlands home in October 2019.

Burgess' lawyer Phillip Boulten SC has accused his former wife of trying to destroy his reputation following the publication of an explosive front-page article inThe Australian.

NRL’s ‘toxic system made me go public’ with domestic violence allegations — Phoebe Burgess https://t.co/LiYcwu1G01 pic.twitter.com/XjJ1BovbII

— Fox League (@FOXNRL)

But Ms Burgess said journalists approached her about rumours, and she handed over a document prepared for her lawyer "instead of covering it up, which is so typical of the system I was part of, that I believe is toxic within the NRL".

Former South Sydney captain Burgess, 31, has pleaded not guilty to stalking or intimidating with the intention to cause fear or physical harm.

The hearing is expected to continue early next year.

Trump aide vows 'professional transition'.

US President Donald Trump's national security adviser Robert O'Brien says he will ensure a professional transition to the team led by Democrat Joe Biden if Biden is deemed the winner of the 2020 presidential election, and "obviously things look like that now".

The Republican Trump has insisted the November 3 election was "rigged" and that he will be declared the winner after a series of legal challenges in several US states.

Speaking to the Global Security Forum, O'Brien said that while he hoped Trump would turn out to have won a second four-year term, he would work with a new administration headed by Biden and his vice presidential running mate Kamala Harr