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Man charged over alleged triple murder after three bodies found in Sydney

A 49-year-old taekwondo instructor has been charged with murdering a family after the bodies of a mother, father and child were found in two separate locations in Sydney. 

Kwang Kyung Yoo will face a bedside court hearing on Thursday after he was charged at about 9pm on Wednesday. 

Police allege his three victims were subjected to an assault with "murderous intent" and died from their injuries.

Forensic police and homicide detectives returned to two separate crime scenes in Sydney's inner west, where a husband, wife and their child were found dead.

Police sources have confirmed that a mother and her child, who were found dead in a taekwondo studio on Tuesday were strangled, while her husband suffered fatal stab wounds.

Detectives are still searching for a motive.

The body of a man aged 39 was found at a home on Watkins Road in Baulkham Hills about 10:15am on Tuesday.

The bodies of his wife, aged 41, and their 7-year-old son were found in Lion's Taekwondo Martial Arts Academy on Daking Street in North Parramatta about 1pm on Tuesday.

Mr Yoo, who runs the taekwondo studio, presented to Westmead Hospital with non-life-threatening injuries on Monday.

Earlier on Wednesday, police confirmed that he had been arrested and would likely be charged with the murders.

Superintendent Daniel Doherty said Mr Yoo used to teach the child martial arts.

Superintendent Doherty said the family lived in Baulkham Hills and described their deaths as "a very sad, tragic event".

Police allege the mother and son were killed inside the martial arts centre sometime between 5:30pm and 6:30pm on Monday.

The man then allegedly used the woman's BMW to leave North Parramatta after 6:30pm.

He then "at some stage" met up or confronted the 39-year-old man in Baulkham Hills.

Superintendent Doherty said police believe the family are from South Korea.

Police have cordoned off the studio and blacked out the windows as forensic officers comb through the scene.

'Really, really awful'

Neighbour Ibby Boufassa described Baulkham Hills as quiet and peaceful, and said it was "very scary" to hear about the incident.

"I feel really, really sad for the child … it's really, really awful the entire family got killed."

Another local resident said the family's deaths would reverberate through the community.

"This is a complex full of kids who probably go to the same school … it's quite sad and shocking," she said.

A friend of the family, who did not want to be named, told ABC News the couple were "very kind and humorous" and adored their little boy.

She said the pair had been together for "a long time" before they got married and described the mother as "a sweetheart".