Derek Chauvin is on trial for George Floyd's death

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"Looks like he's probably on something", Chauvin said, suggesting Floyd had taken drugs.

"That's one person's opinion", Chauvin responded as he got into his squad auto.

Chauvin, 45, who is white, faces two murder charges: second-degree unintentional murder and third-degree murder in the death of Floyd, a 46-year-old Black man. Chauvin, who was sacked from the police force after the killing, is also charged with the lesser offence of second-degree manslaughter.

Earlier, a Minneapolis firefighter, who wept on Tuesday as she recalled being prevented from using her training to help Mr Floyd, returned to the witness box briefly on Wednesday.

Prosecutor Erin Eldridge played police body camera video of Floyd apparently struggling as officers tried to put him in the backset of the police auto.

Chauvin's lawyer said the officer is five feet nine inches and weighs 140 pounds.

George Floyd's struggle with three police officers trying to arrest him, seen on body-camera video, included Floyd's panicky cries of "I'm sorry, I'm sorry" and "I'm claustrophobic!" as the officers tried to push Floyd into the back of a police SUV.

After Floyd falls out of the auto into the street, three officers pin him down with Chauvin kneeling on his neck. Asked by a prosecutor why he did so, McMillian said: "Because what I watched was wrong".

Floyd was "just kind of shaking his head and putting his hands in the air, like, 'Why is this happening to me?'" Martin said. "Mama, I love you", he says.

The convenience store cashier who sold cigarettes to George Floyd and was handed a counterfeit $20 bill said he felt "disbelief - and guilt" as he watched the arrest unfold.

Prosecutors also played store security footage showing Floyd in Cup Foods for about 10 minutes, adding to the mountain of video documenting what happened. But he said he accepted it, despite believing the amount would be taken out of his paycheck by his employer, because he didn't think Floyd knew it was counterfeit and "I thought I'd be doing him a favor". The most serious charge against him carries up to 40 years in prison.

Prosecutors have called several bystanders to describe their horror and fear at watching Floyd die last May.

Floyd seemed to take time to find his words but replied that he played football, Martin said.

The defence has argued that Chauvin did what he was trained to do and that Floyd's death was not caused by the officer's knee, as prosecutors contend, but by Floyd's illegal drug use, heart disease, high blood pressure and the adrenaline flowing through his body.

Similarly, on Tuesday, a high schooler who recorded and shared video of Chauvin kneeling on Floyd said she had lost sleep thinking of what else she could have done.

CCTV footage of George Floyd, right, inside Cup Foods on May 25, 2020, in Minneapolis. Darnella - the teenager whose film of Mr Floyd's death sparked global protests - said she "stays up apologising" to him for "not doing more".

Martin said he told the store manager about the fake bill, however, and the manager eventually called the police. Over the past two days, bystanders and witnesses took the stand including a young child and an 18-year-old girl, as well as an MMA fighter and a firefighter who both attempted to intervene as Chauvin's knee pushed into Floyd's neck. Can you just tell us a little bit more about them and what they said today? He told the court Mr Chauvin had used a risky technique called a "blood choke" and was moving his knee back and forth to increase the pressure on Mr Floyd's back and neck.

Floyd is handcuffed and taken to a squad auto where he becomes increasingly distressed and struggles with the officers who are trying to put him in the back of the vehicle. "I feel helpless. I don't have a Momma either". You can't paint me out to be angry.