Trump vows forceful response

However, the independent autopsy found Floyd died from asphyxiation and showed no underlying medical conditions caused or contributed to Floyd's death, medical examiner Michael Baden said at a news conference.

Benjamin Crump, an attorney for the Floyd family, said that Floyd was essentially "dead on the scene" on May 25. "The ambulance was his hearse," he said.

Following the release of the independent autopsy, the Hennepin County medical examiner's office released a report that said Floyd's death was a homicide resulting from being restrained, noting that he died from experiencing a "cardiopulmonary arrest while being restrained by law enforcement officers".

Derek Chauvin, the former Minneapolis police officer who was seen in a video with his knee on Floyd's neck, has been charged with third-degree murder and manslaughter. He is set to appear in court June 8.

The victim's brother, Philonise Floyd, has set up a GoFundMe account as the Official George Floyd Memorial Fund, which has raised more than $7.5 million as of Monday afternoon.

"This fund is established to cover funeral and burial expenses, mental and grief counseling, lodging and travel for all court proceedings, and to assist our family in the days to come as we continue to seek justice for George. A portion of these funds will also go to the Estate of George Floyd for the benefit and care of his children and their educational fund," Philonise Floyd wrote.

George Floyd's other brother, Terrence Floyd, appeared at a Minneapolis memorial site Monday and called for peace.

"Educate yourself, and know who you're voting for. That's how we're going to hit them. ... Let's switch it up," he said.

Violent protests continued Sunday night and well into Monday in some US cities.

On Sunday, three people died during protests as a result of police returning fire – two in Davenport, Iowa, and one in Louisville, Kentucky.

According to CNN, Davenport Police Chief Paul Sikorski said three officers were patrolling the city when they were ambushed. The officers' vehicles were hit, and one officer was injured. Four people were shot and two died.

In Louisville, one died following an exchange of fire between officers and others at the scene of a protest. Initial investigation found the officers' body cameras were not activated. Police Chief Steve Conrad was relieved of duty by Mayor Greg Fischer for "institutional failure".