A lawyer knew her husband was connected to criminal activity and tried to destroy evidence linking him to a murder because she couldn't live without him, a jury has heard.

As Ali Cevik was sitting in a police cell in the early hours of May 28, 2019, his wife Alev Rojda Oncu desperately tried to find out what had happened.

"I can't do life without you," she texted after his arrest.

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Crown prosecutors allege this was what spurred the 32-year-old Sydney solicitor to try deleting CCTV footage around her Blacktown home which showed Cevik leaving with another man before the murder was committed.

"She did that in order to obstruct or interfere or pervert the course of justice that was in train because (Cevik had) been charged with an offence," crown prosecutor Philip Hogan told jurors on Thursday.

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"She did it, the Crown says, so that she wouldn't have to do life without him."

Cevik pleaded guilty to the murder, details of which cannot be published under court order.

Oncu had been in a relationship with Cevik for six to eight years and first met her husband when he was a "disciplined, hard-trained" mixed martial arts fighter.

However, he then became involved in drugs and people with a "bad reputation," Hogan told Parramatta District Court during a closing address.

The couple got married, bought a home, lived in the granny flat and rented out the main house.

"Life's looking good except that Ali Cevik had gone off the rails but … she can't do life without him," Hogan said.

Hours before the murder, a phone call with Cevik would have made the solicitor aware her husband was about to become involved in serious criminal activity.

"I don't know if I come home tonight. The things I'm about to do, it's not going to be OK," he said.

The following day after police visited her house, Oncu allegedly unsuccessfully tried to unplug the CCTV system located in their bedroom before asking technician Salar Norouzi to attend her home.

"She told him that she wanted to erase the footage," Mr Hogan said.

When police reviewed the CCTV hard drive, they found everything from before when Norouzi was there had disappeared.

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In August 2022, police were able to retrieve the missing footage using updated software.

The missing footage showed Cevik leaving prior to the murder plus Oncu, after her husband's arrest, going underneath the main house with a laundry basket and then meeting with a man and a woman who took a black bag to dispose of in the park behind the home.

Earlier on Thursday, Oncu gave evidence from the witness box saying she had no reason to think anything in her Blacktown home would have been relevant to police.

She denied asking anyone to delete the footage, saying she had worked hard to get where she was in the legal profession.

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"I would never do anything to obstruct or to mislead the system in general. I would never do anything of that nature," she told the court.

The four men involved in the murder, including Cevik, either pleaded guilty or were found by a jury to be guilty. A fifth man pleaded guilty to being an accessory.

The trial with Judge Mark Buscombe continues.

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A Queensland court has overturned a law banning religious knives on school grounds after finding it to be racially discriminatory.

The state had introduced a law allowing Sikhs to carry a ceremonial sword known as a kirpan but it barred those of the faith from carrying the instrument in schools.

Now, the state's highest court has found the legislation to be unconstitutional under the Racial Discrimination Act.

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It comes after Sikh woman Kamaljit Kaur Athwal took the Queensland government to court last year over claims the Weapons Act, which had a blanket ban on carrying the ceremonial sword in schools, was discriminatory.

Sikhs are required to wear a kirpan as part of their religious uniform as prescribed by their code of conduct.

It's one of five religious symbols they carry at all times as part of their faith.

An initial court ruling dismissed the claim the act was discriminatory but now after an appeal, there has been a win for the Sikh faith.

Bill Potts from Potts Lawyers Queensland said the original legislation meant Sikhs "were not able to go to school, not able to go to effectively carry out their religion".

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Potts said the overturning of the law is giving freedom back to those practising the faith and is a "great step forward".

"This just simply means that they have the same freedoms that everybody else has and are not discriminated against by the state legislation," he said.

Despite the court ruling, there are concerns in parts of the community.

Two years ago, a 16-year-old boy was stabbed twice by a 14-year-old with a kirpan at a NSW school.

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Members of the Brisbane Sikh Community said kirpans are all blunt and only very small ones can be carried by Sikh children who have been baptised.

"It's part of our body, it's part of who we are, spirituality is part of our faith," a practising Sikh told 9News.

"It's never to be used to attack anybody it's not there for that purpose, it's there for the purpose to tell us who we are."

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Police also keen to hear from anyone who may have dashcam or CCTV footage.

China's capital recorded its heaviest rainfall in at least 140 years over the past few days as remnants of Typhoon Doksuri deluged the region, turning streets into canals where emergency crews used rubber boats to rescue stranded residents.

The city recorded 744.8 millimetres of rain between Saturday and Wednesday morning, the Beijing Meteorological Bureau said on Wednesday.

Beijing and the surrounding province of Hebei were hit by severe flooding because of the record rainfall, with waters rising to dangerous levels.

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The rain destroyed roads and knocked out power and even pipes carrying drinking water.

It flooded rivers surrounding the capital, leaving cars waterlogged, while lifting others onto bridges meant for pedestrians.

The number of confirmed deaths from the torrential rains around Beijing rose to 21 on Wednesday after the body of a rescuer was recovered.

Wang Hong-chun, 41, was with other rescuers in a rubber boat when it flipped over in a rapidly flowing river. Four of her teammates survived.

At least 26 people remain missing from the rains.

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Among the hardest hit areas is Zhuozhou, a small city in Hebei province that borders Beijing's southwest.

On Tuesday night, police there issued a plea on social media for lights to assist with rescue work.

Rescue teams traversed the flooded city in rubber boats as they evacuated residents who were stuck in their homes without running water, gas or electricity since Tuesday afternoon.

"I didn't think it would be that severe, I thought it was just a little bit of water and that it would recede," said 54-year-old Wang Huiying.

She ended up spending the night on the third floor of her building as the water seeped into the first floor, which holds her steamed bread shop.

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All the machinery is now underwater.

It's unknown how many people are trapped in flood-stricken areas in the city and surrounding villages. Rescue teams from other provinces came to Zhuozhou to assist with evacuations.

"We have to grasp every second, every minute to save people," said Zhong Hongjun, the head of a rescue team from coastal Jiangsu province.

Zhong said he had been working since 2am. Wednesday when they arrived, and expects to work into the night.

They've rescued about 200 people so far.

"A lot of the people we saved are elderly and children," he said.

On Wednesday, waters in Gu'an county in Hebei, which borders Zhuozhou, reached as high as halfway up a pole where a surveillance camera was installed.

Gu'an county resident Liu Jiwen, 58, was evacuated from his village on Tuesday night.

"There's nothing we can do. It's natural disaster," he said.

Two other people were trying to pass through the flooded areas to rescue a relative trapped in a nearby village.

Nearly 850,000 people have been relocated, local authorities in Hebei province said.

The previous record for rainfall was in 1891, the Beijing Meteorological Bureau said Wednesday, when the city received 609 millimetres of rain.

The earliest precise measurements made by machines are from 1883.

Ma Jun, director of the Institute of Public and Environmental Affairs, called the recent rainfall "extreme."

Last year's total rainfall in Beijing did not even top 500 millimetres.

Ma said there should be a review of how cities are planned because some places experience repeat flooding.

"We need to avoid building large-scale construction … in low-lying areas," Ma said.

The record rainfall from Doksuri, now downgraded to a tropical storm, may not be the last.

Typhoon Khanun, which lashed Japan on Wednesday, is expected to head toward China later this week.

The powerful storm, with surface winds of up to 180 km/h, may also hit Taiwan before it reaches China.

Thousands of people were evacuated to shelters in schools and other public buildings in suburban Beijing and in nearby cities.

The central government is disbursing more than $9.4 million for disaster relief in affected provinces.

The severity of the flooding took the Chinese capital by surprise.

Beijing usually has dry summers but had a stretch of record-breaking heat this year.

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The pedestrian died at the scene.