The convenience store cashier who sold cigarettes to George Floyd and was handed a counterfeit 20-dollar note in return has given evidence at police officer Derek Chauvin's murder trial as prosecutors laid out the sequence of events that led to Mr Floyd's arrest and death.

A shop clerk told the court he believed the note Mr Floyd had paid with was fake, and that he appeared to be on drugs but could carry a conversation.

Mr Floyd's death, along with the harrowing bystander video of him pleading that he could not breathe as onlookers yelled at Chauvin to get off, triggered sometimes violent protests around the world and a reckoning over racism and police brutality across the US. "I don't know if you've ever seen someone die in front of you, but it's very upsetting", she said at one point.

Chauvin faces second and third-degree murder charges, as well as one charge of second-degree manslaughter.

The bodycam footage continues until an ambulance arrives and takes an unconscious Floyd to hospital, where he was declared dead.

Observers of the trial say Wednesday's footage may be an attempt by prosecutors to deal with the allegation that drugs played a part in his death.

Lane's bodycam video shows Floyd saying "Please don't shoot me" as he is pulled out of his vehicle outside the store where he paid for a pack of cigarettes with a counterfeit $20 banknote.

He described Mr Floyd as "friendly and approachable".

Hall told the New York Times last June that Floyd didn't resist the arrest and instead attempted to defuse the situation.

Martin said he immediately believed the $20 bill was fake. Another employee went on to call the police.

"Disbelief and guilt", he answered.

Mr McMillian, the first bystander on the scene, can be heard on video at one point telling a handcuffed Mr Floyd "you can't win" and to get into the back of a police squad auto.

Mr Martin and co-workers went outside to a auto where Mr Floyd was sitting with two other people but they refused to return to the store and the manager called the police.

"I felt helpless", McMillian said. McMillian's also on the side telling the cops that they need to take their knee off of Floyd's neck.

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McMillian testified that he recognized Chauvin from an encounter with him in the neighborhood five days before, when McMillan told him that at the end of the day, everyone wants to go home to their families safe.

What else has happened in the trial so far?

Chauvin's lawyer said the officer is 5ft 9in and weighs 140 pounds.

Four young witnesses took to the stand on Tuesday.

"I thought if I would not have taken the bill this would have been avoided", he said.

Her voice began to tremble when she recalled the impotence that overwhelmed her as Thao and the other officers blocked her from providing the kind of medical care she has been trained to give.

"Mr. Morries Lester Hall, through undersigned counsel, hereby provides notice to all parties in this matter that if called to testify he will invoke his fifth amendment privilege against self-incrimination", said a notice filed by Assistant Public Defender Adrienne Cousins.

He rejected defence suggestions that he and other bystanders' interactions with police had been threatening to the officers there.

FLORIDO: And when it was the defense attorney's turn to question this witness, he also pressed her the way that he had pressed Donald Williams earlier to acknowledge that the group of bystanders grew loud and started calling Chauvin names.

Chauvin kneeled on the back of Floyd's neck for 9 minutes and 29 seconds as Floyd cried repeatedly that he could not breathe.

A number of witnesses have expressed survivor's guilt about what they did and didn't do leading up to Floyd's death.

The verdict in this case will be widely seen as an indication of how the U.S. legal system treats deaths that occur while in police custody.

But despite the global outcry this is not an open and shut case.