A man who has pleaded guilty to murdering his housemate made a telling Google search two days before the killing.

Shuo Dong, 21, murdered 28-year-old Qi "Kathy" Yu in their Sydney apartment on June 8, 2018.

Ms Yu’s body was found wrapped up and dumped on the side of the M1 motorway 47 days after she first disappeared.

Dong stood before Acting Justice Peter Hidden in the NSW Supreme Court in Sydney, where he pleaded guilty.

Chilling evidence that Dong was to commit the murder was also revealed to the court.

Ms Yu's body was dumped by the side of the motorway

According to the agreed facts, presented by crown prosecutor Gareth Harrison, Dong made a number of Google searches between 3.44pm and 3.52pm on June 6, 2018, "two days before the murder of the deceased" reported News.com.au.

The facts state: "A Google search was made for 'How would Homicide be sentenced in Australia,'" before visiting the following web pages:

• "Legal knowledge, how many years would intentionally homicide be given in Australia."

• "The sentencing criteria for intentional homicide. What expenses must be compensated for after intentional homicide."

• "What are the characteristics of intentional homicide? And how to properly determine intentional homicide?"

He researched how homicide would be sentenced in Australia

• "Australian Chinese life knowledge, our steps, life and other staff, comparison of underage criminal offence sanction between China and Australia."

Dong was charged with Ms Yu's murder on June 12, 2018, and has been in custody since.

He moved into the downstairs bedroom on May 20, 2018 - Ms Yu lived upstairs with their other female housemate Jianing Wu.

But Dong almost immediately told Ms Yu that he wanted to move out and was due to do so on June 9 that year, the day after he killed her.

Ms Yu was killed between 7.16pm and 10pm on June 8.

On the night of the killing, Ms Yu was on the phone to her mum when she messaged her to say there was a power outage.

According to the crown prosecutor's submissions Ms Yu said: "OMG. We’re having a power outage... something is not right, only our household is having a power outage."

She did not reply to any further messages.

From 9:33pm that night, Dong had also "made about 18 searches of different areas around Sydney" before dumping Ms Yu's body between 10pm and 10.30pm.

According to a psychiatric report from Dr Sathish Dalayan, Dong has a history of "strong violence."

However there is no evidence to suggest that Ms Yu's murder was influenced by his behaviour.

The sentence hearing is due to resume before Acting Justice Hidden on August 7.