Police seeking help to hunt down Sydney woman's killer

When police arrived at the Newman Street unit they found a 38-year-old man, believed to be Ms Gilbert's partner, performing CPR on her body.

Ms Gilbert had suffered "very serious and severe" injuries, Supt Holland said. 

The man was taken to Granville Police Station for questioning and has since been released, with no charges laid.

"We believe Erin was at home in the unit block that evening," Supt Holland said. 

"We're concerned someone else may have been at the unit block with her." 

Police established a crime scene and specialist forensic police are investigating.

"Erin and her partner are well known in the local community," Supt Holland said adding that police had also spoken to Ms Gilbert's husband and he had been "very forthcoming".

Detectives are treating her death as suspicious but the cause of death remains unknown.

Police are appealing to the public for help in establishing a timeline in the case. Detectives with help from the State Crime Command's Homicide Squad, have established Strike Force Trevelyan to spearhead the investigation.

NSW Premier Chris Minns said he was committed to working towards cutting the rates of domestic violence after two alleged murders in Sydney in as many days.

"Obviously, the allegations are horrifying," he told reporters on Tuesday.

Lisa Fenwick, 59, was stabbed to death at a Mascot apartment on Sunday and her partner, Anthony Eriksen, 61, has been charged with murder.

Police Minister Yasmin Catley and Domestic Violence Minister Jodie Harrison were seeking briefings from their departments on possibly boosting existing funding arrangements, Mr Minns said.

"There are concerning reports that there has been an increase in the number of reported incidents of domestic violence across NSW.

"Any increasing rates of domestic violence across the community are a concern to the government.

"If we have to take extra steps, that's exactly what we'll do."

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