Homicide Squad detectives will prepare a report for the coroner following the deaths of a woman and three children at a house in Tullamarine yesterday.
Emergency services were called to the property on Burgess Street shortly after 12.20pm on Thursday, 14 January.
Police located the bodies of a 42-year-old woman, a seven-year-old girl, a five-year-old girl and a three-year-old boy inside the address.
All were residents of that property.
A 48-year-old man, who also resided at the house, assisted police and last night was released without charge.
Detectives have also spoken to a large number of people, including the family, friends, and neighbours of the deceased.
An extensive forensic examination of the scene has also been conducted.
Investigators do not believe the 48-year-old man was involved in the incident and police are not looking for anyone further in relation to the matter.
Homicide Squad investigators have formed the preliminary view that the 42-year-old woman is responsible for all four deaths and on completion of their investigation, a report will be provided for consideration of the coroner.
Victoria Police would like to thank everyone who assisted in this distressing and challenging investigation.
Anyone with information who has not yet spoken to police is asked to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppersvic.com.au
Support is available and anyone experiencing difficulties should contact Lifeline on 13 11 14 or Beyond Blue on 1300 224 636.
Quotes attributable to Acting Deputy Commissioner Robert Hill:
“I know there will be many people in the community struggling to understand and come to terms with this tragedy.
Police will particularly work to support the families of those involved over the coming weeks and ensure they have the help they need.
“This has also been an incredibly difficult time for both the police and paramedics who responded and attended the scene yesterday.
“This has been an incredibly heart wrenching experience for all concerned.”