Daily London
He drove the woman’s BMW to the family’s home in Baulkham Hills and fatally stabbed the 39-year-old father.
The 51-year-old did not look at the victims’ family and other supporters as they sobbed in the court’s public gallery after the extreme sentence was handed down.
Justice Ian Harrison found the three murders were objectively very serious, motivated by a financially struggling Yoo becoming jealous of the family’s success.
“These killings were horrific and violent acts, senselessly cruel and cynical,” the judge said.
To impress his own wife, he would send emails to himself, pretending to be important people.
In reality, at the time of his arrest, Yoo owed tens of thousands of dollars in debt and was behind on rent.
The victims cannot be identified due to NSW legal restrictions on identifying child victims of crime.
