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Updated May 3, 2026 — 12:28pm,first published May 3, 2026 — 6:32am
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Police believe a man allegedly killed his brother and parents in a drug-induced frenzy in their Sydney home before returning to the “very grisly” crime scene and being arrested, after a surviving sibling called police.
Emergency services were called to the Juliet Close home, in Rosemeadow near Campbelltown, just after 1:30am on Sunday by a man, aged 30, who had allegedly been assaulted by his brother.
Inside the home, police found their 65-year-old mother and 64-year-old father both badly injured.
Their mother was carried into the rear yard of the home but police and paramedics could not save her life.
Their father had suffered serious blunt force head injuries and was treated at the scene by ambulance officers. He was taken to Liverpool Hospital, where he later died.
Police swept through the property and into a granny flat where they found the third brother, aged 25, dead inside.
Police at the house in Rosemeadow, where three people died in an attack on Sunday morning.Dean SewellThe 32-year-old eldest brother had allegedly used a bladed and blunt weapon, potentially a hammer, to attack his family before fleeing the scene, early investigations suggest.
“It’s a very extensive crime scene. We haven’t recovered a weapon at the moment, but we are systematically working through the granny flat, and then we will go through the house,” Superintendent Grant Healey told reporters on Sunday.
“Police were confronted with a very bloody scene. Blunt force trauma is always horrendous for people to confront, and any edged weapon attack is horrendous to confront.
“So police and ambulance did a fantastic job in very trying circumstances.”
The silver sedan being towed as police watch on at the scene on Juliet Close.Dean SewellAt about 2.30am, the 32-year-old alleged killer returned to the scene at Juliet Close in a silver vehicle.
Police arrested him, and he is now at Campbelltown Police Station being interviewed. He is yet to be charged.
Superintendent Healey said the family were not known to police.
“This is a very tragic incident that there was no way for us to predict this type of thing was going to occur,” he said.
Sources with knowledge of the unfolding investigation say it appears the alleged killer was affected by drugs.
Healey said he could not confirm that yet. Police are working to piece together his missing hours.
“We’re trying to track his journey, so if anybody saw a silver sedan in the Rosemeadow area in that time of the morning, could they contact us, please?” Healey said.
Photographs from the scene show a silver vehicle being towed away as forensic police enter the home and remove evidence in brown paper bags.
A grey vehicle was taken from the scene in Rosemeadow on Sunday morning.Dean SewellPolice said they had responded to reports that a number of people were assaulted at the home by a man known to them.
A crime scene has been established and Campbelltown police, with the assistance from State Crime Command’s Homicide Squad, are investigating.
A report will be prepared for the coroner.
Note: An earlier version of this story listed different ages for the siblings. It has been updated with the latest information from NSW Police.
Anyone with information is asked to call Crime Stoppers on 1800 333 000.
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Perry Duffin is a crime reporter for The Sydney Morning Herald.Connect via X or email.
Ben Cubby is an investigative reporter for The Sydney Morning Herald.Connect via X or email.