Six terrifying words said by the parents of a mother of five killed in suspected murder-suicide at the shocking scene – as neighbors tell of horrifying screams coming from the house

A mother of five has died in what appears to be a murder-suicide in Victoria while four other people, including two of the woman's teenage sons, were at home.

Rebecca Young, 42, was found dead with knife wounds at the property on the outskirts of Ballarat, west of Melbourne, about 9pm on Friday night, along with her partner Ian Butler, who has links to the Bandidos motorcycle gang.

A neighbor told reporters outside the Sebastopol estate that Ms Young's distraught parents had arrived late on Friday evening and could be heard saying: “I told you to leave him.”

It is believed emergency services were called by others to the Morgan St property. Butler, 55, allegedly murdered Ms Young and then killed herself.

Police have said they are not looking for anyone else in connection with the deaths.

Bandido bikie Ian Butler was also found dead. He is suspected of killing his Mrs. Young and then himself

Local detectives are leading the investigation with assistance from the Victoria Police homicide squad.

“The exact circumstances surrounding the incident are yet to be established at this stage, but detectives are not looking for anyone else in connection with the case,” Victoria Police said.

They have not confirmed how the couple died.

Other neighbors who care for the two teenagers who were at the property described the pair's relationship to Nine News as 'volatile'.

A forensic police officer is investigating the home on Friday evening. It is understood the woman's two teenage sons were in the property and are being cared for by neighbours

The tragedy follows Ballarat already reeling from the unrelated disappearance of Samantha Murphy earlier this month.

Anyone with information is asked to contact Crime Stoppers.

For confidential support, please call Lifeline on 13 11 14.