Police are investigating the suspected murders of four people in just three days after the bodies of a man and a woman were found at separate Girrawheen homes in less than an hour yesterday.
The deaths came as major crime squad detectives probed the suspected murder of father-of-two Ilario Maiolo in Halls Head on Monday morning and the fatal assault of Richard Tavis Holloway, who was found in his South Perth unit on Tuesday evening.
Within hours of the discovery of the two bodies in Girrawheen, police had taken one man into custody for questioning. It is understood all three knew each other.
The 37-year-old man was found dead at a Danbury Crescent home about 3.30pm, and at 4.20pm police responded to a report of a woman injured at a home in nearby Arnos Way.
Paramedics arrived before police and tried to save the 31-year-old woman but it is understood she was dead when officers arrived.
A lane links Danbury Crescent and Arnos Way and police are appealing for anyone who saw any suspicious movements near the properties, in the lane or nearby parks to come forward.
A Danbury Crescent resident said he had been outside checking his mailbox about 3pm when a man had ridden up on a motorcycle and rushed to the front door of a nearby two-storey brown brick home, which is believed to be linked to the homicide inquiry.
The resident, who did not want to be named, said when no one answered the door, the man went to the other side of the house and smashed some windows.
"I would say he appeared to be in an irrational and panicky mood," the resident said. "After that (the windows smashing) everything went quiet and later a couple of ambulances came."
The resident said he saw one ambulance at that two-storey home and a second at a house across the road, which neighbours believe is owned by the same people.
It is believed the resident of the two-storey house runs a gym from the property and neighbours say people are always coming and going from the home.
The deaths came just hours after a woman who found her best friend dead in his South Perth apartment on Tuesday evening pleaded with his killer to "come clean".
Jacqui, who did not reveal her surname, was shaking as she recounted how she had found Mr Holloway slumped on his couch, his face covered in blood, when she broke in to feed his cat.
"I hadn't seen him for a few days and we were worried about the cat starving, so we broke in to feed the cat but we found Richard," she said.
Police believe the 42-year-old was assaulted in his Albert Street unit as early as Sunday.
Major crime squad Acting Det-Insp. Greg McDonald said: "Those injuries have clearly, we believe, caused his death."
Friends said the disability pensioner was a gentle, kind man who used to let homeless people stay with him at his State housing unit and they feared that kindness may have led to his death.
Jacqui said Mr Holloway had a rough upbringing and had lost partial sight in one eye in an accident. But he was a caring man who used to describe his 11-year-old Bengal cat as his best friend.
This morning a 31-year-old Halls Head man has been charged over the death of Mr Maiolo in Halls Head on Monday morning.
He is due to appear in Mandurah Magistrate’s Court today.