Six-year-old girl may have witnessed fatal stabbing as accused David Nadi Lamie Moussa faced court

The shocking fatal stabbing of a Clarkson father allegedly at the hands of his own son may have been witnessed by a six-year-old girl.

WA Police Commissioner Col Blanch told a press conference on Wednesday that a youngster was at the Elsbury Approach home when the 72-year-old was attacked.

When asked if the girl saw what happened, he said: “That’s my understanding. I can confirm that.”

Mr Blanch’s comments came as David Nadi Lamie Moussa faced Joondalup Magistrates Court charged with murdering his dad and causing his stepmother grievous bodily harm after allegedly breaking into their Clarkson home in the early hours of Tuesday.

During the brief hearing, the 31-year-old, who was dressed in a white boiler suit, did not speak and only nodded to confirm his name.

A duty lawyer indicated to the court they would be seeking a mental health assessment for Mr Moussa.

His matter was adjourned to Stirling Gardens Magistrates Court for later in February.

Homicide squad detectives arrested Mr Moussa after emergency services found his 72-year-old father dead at his Elsbury Approach home.

Emergency services were called to the address about 6.25am where a 52-year-old woman, Mr Moussa’s stepmother, was also found seriously injured.

It is understood the woman is recovering at Royal Perth Hospital.

Detectives were at the scene on Tuesday morning blocking off almost all of Elsbury Approach as investigations continued.

Forensic investigators set up a large white gazebo over the driveway of the property and next to a white SUV that was smeared with blood over the driver’s side door.

Resident Nigel Smith said he saw multiple ambulances rush to the property moments after hearing sirens.

“This morning I was laying in bed, I heard quite a lot of sirens about 6.20am but didn’t think much of it,” he said.

“I thought it was fire engines going further north and then I heard a siren which was very, very close.

“I looked out from the patio, and I could see them, there were two or three ambulances already there, on Elsbury Approach and then a police car there and a police officer, the ambulance, a door was open as well to one of the vehicles.”