A neighbour reacts to news of the deaths. Photo: Paul Jeffers

A woman found dead in Deer Park this morning in a suspected murder-suicide overnight had taken out an intervention order against her husband that expired just four days earlier. 

The man - whose identity is yet to be made public - is believed to have killed his estranged wife before driving his car into a truck in the early hours of Sunday morning.

The couple's three-year-old son was in the house at the time of the murder and was taken by police into the care of the Department of Human Services. 

A neighbour reacts to news of the deaths. Photo: Paul Jeffers

Police found the body of the woman in the Corey Close house around 7.45am this morning following investigations into the car crash in Truganina three hours earlier.

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Police had attended the the house where the man lived with two tenants, a young couple to inform his relatives of his death when they made the grim discovery. 

The man died when his car veered into an oncoming truck on Hopkins Road just after 4am.

Police at the scene in Deer Park. Photo: Paul Jeffers

Homocide Detective Sergeant Paul Tremain said police were aware of a history of domestic violence going back to at least 2012. 

"There was an intervention order taken out in 2012 which expired four days ago," Detective Sergeant Tremain said.

"Theres are just shocking circumstances of two people who couldn't work out their differences and its ended in a tragedy like this," he said. 

Police were still at the scene of the murder on Sunday afternoon and have yet to release details of how the woman died, citing the need for an autopsy. 

Detective Sergaent Tremain said the death was being treated as suspicious and no other suspects were involved. 

"At this stage, I can't really go into what's happened," he said. 

Grieving relatives of the dead man were distraught when they arrived at the house this morning. Police have yet to be able to notify the woman's next of kin. 

Neighbours who lived in the street said it was a quiet neighbourhood but most residents did not know their neighbours. 

Neighbour Sandra Moran who lived across the street said the man killed in the accident had split from his wife, and lived in the house with two tenants, a young couple who had recently moved in. 

"It's a bit disturbing," she said.

Along with the son, the housemate who shared the house was also home at the time of the murder. 

His brother, 17-year-old Jackson Kelly told Fairfax Media his brother, 22-year-old James Negri called him in distress after hearing the news. 

"He's pretty shaken up," he said. 

Mr Kelly said his brother had heard the sound of a woman moaning and heard the little boy crying but believed the couple were having sex so went back to sleep. He did not know the woman had been killed until police ran passed his window the next morning.

Mr Kelly believed the couple were divorced but the wife visited the house frequently and shared custody of their son. 

"They had just come back from India. I thought they were trying to work it out," he said. 

Mr Kelly said he had never seen any fights or violence between the couple.

"He seemed like a nice, normal guy. I don't know why he turned like this. I can't believe it," he said.