Shikha Godara Beniwal, left, and Sunil Beniwal. Source: Supplied

The man, believed to have committed suicide by swerving his car into the path of a truck this morning, is Sunil Beniwal.

His wife, who was later found dead at a house in Deer Park, is Shikha Godara Beniwal.

Shikha Godara Beniwal, left, and Sunil Beniwal.

They had a three-year-old son together.

Mr Beniwal died when his car veered on to the wrong side of the road and hit a truck at 4am on Hopkins Rd, Truganina, near Caroline Springs. The truck driver suffered minor injuries.

A woman after arriving at the scene of the suspected murder-suicide in Deer Park. Picture: Hamish Blair

Police found his wife’s body after investigations led them to do a welfare check at his Corey Close home at 7.45am.

Detective Sgt Paul Tremain said an intervention order had been taken out in 2012 that expired four days ago.

A man outside the home in Deer Park. Picture: Hamish Blair

“There is a history (of violence) going back,” he said.

“Orders have a life span. It’s passed that life span.”

The scene of the fatal car crash in Hopkins Rd, Truganina. Picture: Hamish Blair

He said the victim did not live at the address where she was allegedly murdered.

“At this stage I can’t go into what’s happened. We need an autopsy,” he said. “We believe there is no one else involved.”

The scene of the crash in Hopkins Rd, Truganina. Picture: Hamish Blair

Jackson Kelly, 17, said his older brother, James Negri, rented a room in the alleged killer’s home.

He said his brother had heard noises coming from a bedroom last night, but thought the pair were having sex.

Detectives investigate the suspected murder in Corey Close, Deer Park. Picture: Hamish Blair

“He heard cops at the back of the house the next morning. They told him to get outside,” he told the Herald Sun.

He said he was under the impression Mr Beniwal had been trying to reconnect with his wife and they were living together with their son.

Police in Corey Close, Deer Park. Picture: Hamish Blair

He said his brother and his brother’s girlfriend had been tenants at the home for two months.

“I’ve met the family. He was the nicest guy. I was shocked,” he said.

A forensics police officer takes photos at the scene in Deer Park, Australia. Picture: Hamish Blair

Neighbour Sandra Moran said: “The dog started barking at 11.30pm-ish, that’s all I heard,” she said.

“I think the wife has left him. He has the child on the weekend. It’s a little bit disturbing.”

Police on the scene where a body, believed to be part of a murder-suicide, was found in Corey Close on Sunday, December 14, 2014, in Deer Park, Australia. Picture: Hamish Blair

Other residents described the area as a very quiet neighborhood and said this was the first time a police car had been in the court in two years.

“You don’t expect it. It makes you think what could have happened,” Karla Smith, 27, said.

“He could have been running around with a knife. You never really know what state of mind someone is in. I just feel for the child now.”

Police will prepare a report for the Coroner about both deaths.