George Floyd will never see his six-year-old daughter walk down the aisle, her mum said in an emotional speech demanding justice.

Roxie Washington shares little Gianna with the tragic dad, 46, whose death in police custody in Minneapolis has caused outrage across the US and the world.

She was speaking at a virtual news conference on Tuesday alongside her little girl and their legal team.

Holding back tears, Ms Washington said: "Gianna does not have a father. He will never see her grow up, graduate. He will never walk her down the aisle.

Roxie Washington fought back tears as she spoke about George Floyd

"If there’s a problem she’s having and she needs her daddy, she does not have that anymore."

She told reporters she wants all four officers involved in Floyd's death to pay for the killing.

"At the end of the day, they get to go home and be with their families," Ms Washington said.

It comes as tens of thousands of demonstrators continue to clash with law enforcement as they march the streets of cities including Minneapolis, Washington, Los Angeles and New York.

Six-year-old Gianna was present at the virtual press conference
Gianni clung to her mum during the conference

"He loved her, he loved her so much," Ms Washington said of Mr Floyd's feelings for their daughter, who clung to her throughout.

"I'm here for my baby," she said. "I'm here for George because I want justice for him, and I want justice for him because he was good. No matter what anybody thinks, he was good."

Mr Floyd's hometown of Houston, meanwhile, held a memorial march for him yesterday,where attendees recounted a "gentle giant" whose legacy had helped the city largely avoid the violent protests seen elsewhere.

Attorneys L. Chris Stewart and Justin Miller flanked the mother and child

The mayor's office said 60,000 people gathered downtown to honor Mr Floyd.

Floyd lived most of his 46 years in Houston's historically black Third Ward neighborhood, located about a mile south of the park where the march began.

He moved to Minneapolis in recent years for work.

The memorial march was organized by well-known Houston rappers Trae Tha Truth, who was a longtime friend of Floyd's - and Bun B, who worked directly with Floyd's family for the event.

Protests have been held across America since George Floyd died on 25 May

Houston's mayor and police chief attended.

"We're gonna represent him right," Trae Tha Truth, whose given name is Frazier Thompson III, told the crowd of several hundred people gathered for the march.

"We are gonna tear the system from the inside out."

He added: "George Floyd is looking down at us now and he's smiling."

George Floyd died aged 46 after an officer knelt on his neck for more than eight minutes

After a prayer, the marchers exited the park and began to walk toward City Hall.

Democratic US Representative Sheila Jackson Lee, who represents portions of Houston where Floyd was raised, told the crowd that she would introduce police reform legislation in
Congress on Thursday in honor of Floyd.

Mayor Sylvester Turner, who is black, said he understood marchers' pain and told them they were making an impact.

Yesterday, peaceful demonstrators across the street from the White House were tear gassed as Donald Trump made his first presidential address since the death of Mr Floyd.

Trump held up a Bible at a church across the street from demonstrators
Protestors are tear gassed as the police disperse them near the White House

The US president vowed a massive show of force to end violent protests, which have also included mass looting.

But moments after he spoke in the Rose Garden, police and National Guard personnel, including officers on horseback, moved on protesters in Lafayette Park and used tear gas and rubber bullets.

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The police action against the protesters gave Trump a safe passage from the White House to nearby St John's Episcopal Church.

This then allowed him to undertake a bizarre photo opportunity holding a Bible.

Attorney L. Chris Stewart and Justin Miller have been retained by Mr Floyd's family in its criminal complaint against his death last Monday.

He said yesterday's conference was held to help show the human side of the tragedy.

In shocking footage which emerged last Tuesday, Mr Floyd is seen pleading for his life as he is pinned to the ground with a knee to the neck for nearly nine minutes.

Veteran cop Derek Chauvin has since been charged with third-degree murder.