Pictured: Woman, 20, found dead after being missing for days

A woman who was found dead in a Sydney home has been identified as Gabriella Delaney.

The 20-year-old was discovered at a home in Cambridge Park, in Sydney’s west, on Monday night and her body is believed to have been there for as many as six days.

Her brother, 30, was arrested on Tuesday in relation to the death, NSW police confirmed to Yahoo News Australia on Tuesday afternoon.

Her body was so badly decomposed that investigators were initially unable to determine exactly how she was killed, or if a weapon was used, the ABC reported.

The woman has been identified as Gabriella Delaney. Source: Instagram/linkedIn

Given the state of her body when police arrived at the home at about 9pm on Monday night, the cause of Ms Delaney’s death remains unclear.

However, foul play is strongly suspected, NSW Police Detective Inspector Jason Pietruszka told reporters today.

“The lady had not been seen since June 3 so we are dealing with a situation where further information is required to get an actual cause of death,” he said.

“We do believe unfortunately that it is foul play and it is being investigated as a homicide.

“It was quite a confronting scene.”

Investigators could be seen removing a blood stained sofa chair from the house on Tuesday.

Police were tipped off after the parents of Ms Delaney, who live in Western Australia, called the authorities after not hearing from their daughter for nearly a week.

On Tuesday night, NSW police said the 30-year-old man had been charged with murder and would appear in Parramatta Local Court on Wednesday, after being refused bail.

Police investigate after a 20-year-old woman was found dead. source: 7 News

Online, friends mourned the young woman and artist.

“You were such a sweet girl! Always loyal to your friends & always smiling,” one friend wrote on Facebook.

“May our Heavenly Father comfort your family at this time. Rest in love & peace beautiful Gabriella Delaney, love you girl.”

Ms Delaney is the 30th Australian woman killed in a suspected domestic violence case this year, according to the Western Sydney-based Nepean Domestic Violence Network.

“This is sad news for our community as she was a local Cambridge Park resident. Our thoughts are with her family,” the group said this afternoon.

Do you have a story tip? Email: newsroomau@yahoonews.com.

You can also follow us on FacebookInstagram and Twitter and download the Yahoo News app from the App Store or Google Play.