Baulkham Hills, North Parramatta: Mother and her baby son are reportedly stabbed to death before her estranged husband is murdered in their home in suspected 'love triangle murders'
A mother and her infant son were reportedly stabbed to death at a martial arts studio shortly before her estranged husband was murdered less than three miles away after a suspected love triangle turned sour.
The bodies of Min Cho and her seven-year-old son Benjamin were found at the studio in North Parramatta in Sydney's west on Tuesday, two hours after her estranged husband Steven Cho was found dead at their nearby Baulkham Hills home.
Taekwondo instructor Kwang Kyung Yoo is under police guard in hospital after undergoing emergency surgery for knife wounds.
Police are investigating whether Mr. Yoo had a romantic relationship with Ms. Cho and whether their relationship recently soured.
Police believe that the three deaths probably occurred within a five-hour period between 8 p.m. Tuesday evening and 1 a.m. Tuesday morning.
Mr Yoo runs Lion's Taekwondo studio in North Parramatta, where it is believed Ms Cho and Benjamin – a Year 2 student at Winston Hills Public School – were stabbed to death in the gym before their bodies were dragged outside to an adjacent alley.
Min Cho (left), her estranged husband Steven (right) and their son Benjamin were all found dead on Tuesday
Master Lion Yoo (pictured) is under police guard at the hospital after he showed up at the emergency department around 1 a.m. on Tuesday with non-life-threatening injuries. he has since undergone surgery
It is understood Mr Yoo turned up at Westmead Hospital early on Tuesday morning, bloodied and with serious injuries.
Hospital staff called in police to investigate his injuries after Mr Yoo told them he was injured at his taekwondo studio on Monday evening.
The body of Ms Cho's estranged husband Stephen was found in the kitchen of his townhouse on Watkins Road in Baulkham Hills.
He was also allegedly stabbed.
Mr Cho's mother is said to have arrived at the house earlier in the day to be told by police that 'her entire family had been wiped out'.
Benjamin had just started Year 2 at Winston Hills Public School.
Shocked parents exclusively revealed to Daily Mail Australia how they received a 'weird text' from the Lion's Taekwondo studio on Tuesday morning.
The message stated that classes had been canceled because the academy's lead instructor, Master Lion Yoo, was in the hospital.
“Due to injuries sustained from a car accident this morning, Master is currently in the hospital,” the report said. 'That is why Taekwondo classes are temporarily suspended from today.'
One mother admitted that she knew it was “obviously not a car accident when I saw all the police outside the studio when I went to pick up the kids from school.”
Master Lion, in his late thirties, is said to be married and have a young son, Kai. Parents of his students describe him as a 'nice man who is very quiet and timid'.
“The way he is connected to all of this is what worries me,” one mother added.
A crime scene at Lion's Taekwondo Academy in Daking Street, Parramatta, has also been sealed off, with firefighters covering the windows of the martial arts studio.
Homicide detectives have launched an investigation after a woman and a child were found dead in Sydney's west and the body of a man was discovered five kilometers away in Baulkham Hills.
Steven Cho (right) worked for construction company Richard Crookes, while his wife Min Cho (left) worked at various companies in recent years. They bought their house in 2016. The former couple is pictured celebrating their son Benjamin's first birthday
A third crime scene at Lion's Taekwondo Academy in Daking Street, Parramatta (pictured) has also been sealed off, with firefighters covering the windows of the martial arts studio.
The crime scene at Lion's Academy on Daking Street has been sealed off and firefighters have covered the windows of the martial arts studio.
It is believed the black plastic was added to all windows facing the main street to hide the eerie scene in the studio from bystanders.
Black plastic on all windows of the martial arts studio overlooking the main street (pictured) was used to hide the creepy scene in the studio from bystanders
At the martial arts studio in Sydney's west where a woman in her 40s and a child were found dead on Tuesday morning
Forensic officers were also seen searching an alley at the side of the academy building, where locals said they had been told a body had been found.
At the Baulkham Hills address, a detective ran out of a car and ran into the driveway, under police tape and onto the crime scene at around 3.15pm.
The mansion's front window was also smashed, with broken glass sprayed onto the exterior concrete.
The State Crime Commando Homicide Squad has now taken over the investigation, a NSW Police statement said.
The studio in North Parramatta's usually quiet Daking Street was a crime scene on Tuesday
Forensic officers spent much of Tuesday investigating the grim scene at the martial arts studio
The front window of the townhouse at the Baulkham Hills home where the dead man's body was found was smashed
The woman and child were found at an address in North Parramatta shortly after the man's body was found three miles away in Baulkham Hills at around 11am (pictured)