The 29-year-old Irish national was found by Emergency Services at midnight outside his home in Padstow after reports of a fight involving a number of people.

"Immediately noticed when arriving on the scene was a man in his driveway who had what appeared to be a stab wound in his neck," said Detective Chief Inspector Glen Fitzgerald.

Paramedics attempted to revive Mr Walsh, however he died at the scene.

Cathrina Ann Cahill and a 36-year-old Revesby man were arrested at the scene and taken to Bankstown Police Station to assist with the investigation into Mr Walsh's death. Two flatmates were also present at the house.

On Saturday afternoon police charged Ms Cahill with the alleged murder of Mr Walsh. The Revesby man was released without charge.

Mr Walsh and Ms Cahill, both Irish nationals living in Sydney, had been engaged for five weeks before the incident.

Their social media pages show many images of the couple celebrating their relationship.

Mr Walsh was the father of three daughters and is believed to have moved to Australia from Enniscorthy, Wexford in 2012.

A Wexford County councillor, John O'Rourke, told the 'Irish Independent' that the town has been numbed by the tragedy.

"I've known him since he was a child. I managed an under-12 team at Ajax Athletic football club and he was a handy young player. In his early 20s, he played for Enniscorthy United," he said.

"David grew up in Moran Park in the town, the son of highly respected builder John Walsh. He was one of six children. David leaves behind three daughters."

Police have been working with the Irish Consulate to notify the families of both Mr Walsh and Ms Cahill of the events that have occurred.

Ms Cahill has been refused bail and will appear before Parramatta Court on Sunday.

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