Police investigating the death of a man in Ellenbrook are speaking to three men but are yet to lay any charges.
He said early indications were that police were not looking for anyone else in relation to the death but investigators were keeping an open mind.
Police last night cordoned off Pinea Turn as they investigated the third suspected murder in WA since Sunday.
Det-Insp. Lee said police still wanted the public's help and asked any residents who had heard anything yesterday or anyone else with information about the incident to call Crime Stoppers on 1800 333 000.
Police say they are not yet sure what sparked the attack.
It is understood the 36-year-old man did not live at the Pinea Turn address.
Police were called to the home yesterday shortly after 4pm as St John Ambulance officers rushed a man from the house to Swan District Hospital. It is understood he died from stab wounds.
While forensics officers moved in and out of the property, detectives spoke to witnesses, including guests leaving a nearby wedding.
Just hours before the Ellenbrook incident, homicide squad detectives left Perth for Broome to investigate the suspected murder of a 27-year-old Broome man.
A 38-year-old woman was last night being questioned by police but no charges had been laid.
Yesterday's deaths came after the death of a 17-year-old girl at a Goldfields Aboriginal community on Sunday.
A 17-year-old boy has been charged with one count of murder and _The West Australian _understands the accused and both his parents have been targeted in suspected acts of tribal punishment.
Police allege the teenager used a metal pole to bash the victim about noon on Sunday.
It is understood he was later taken into scrub and assaulted as tribal punishment.
_The West _ understands that the boy's parents were targeted - his father was assaulted and his mother's car set on fire - within 24 hours of that attack in an apparent act of tribal punishment meted out because they took their son to see the girl at the community.
Warburton community adviser Damien McLean confirmed the events happened.
"They were just two events that happened," Mr McLean said.
"It wasn't like there was a riot or anything like it."
The Royal Flying Doctor Service treated the boy and took him from the community on Monday.
It is believed his injuries included fractures.
The accused boy, who cannot be named for legal reasons, had a bedside Children's Court hearing at Royal Perth Hospital.
He was remanded in custody and is due to appear in court on Tuesday.
Broome police described the death of the 27-year-old man at the Forrest Street home as "violent and tragic".