The child was found in critical state by the police authorities. Passersby and neighbours reported hearing horrific screams coming from inside the house. The police officials who responded to calls from neighbours rushed inside and took the critically injured infant to hospital but the baby could not be saved. She succumbed to injuries.
Her grandmother and mother, Yuanyuan Cao, 28, originally from Luoyang in China, were also stabbed. Ms Yuanyuan’s partner George was working at the time of the attack.
Detective Inspector Tony Duncan told a media conference investigators were still searching for answers as to why the tragedy unfolded.
Duncan said the baby’s father was at work when police believe the grandfather started stabbing the trio. The father, a small-business owner, did not know his child was dead until detectives told him. He is being comforted by family.
Duncan also added that there were no recent incidents at the home to point to such a horrific turn of events.
"The father actually expressed his surprise that something could happen," he said.
The grandparents had travelled to Australia from China in December as the baby’s mother prepared to return to work at a bank and needed help with childcare.
They had previously been in the country in September for the birth of the child.
Det Insp Duncan said the grandfather, 53, who was found in the front yard of the property with life-threatening injuries, which police believe may have been self-inflicted. All three underwent surgery last night. The grandfather was out of intensive care and is expected to speak with police in the coming days. The grandmother is still in intensive care, and the mother is recovering and has spoken with police.
The horrific incident took place supposedly after an argument broke out between the grandparents and the young mother.