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A woman who watched as Minneapolis police officers pinned George Floyd to the pavement during his May 2020 arrest testified on Friday that she knew instantly that the man was "in distress," as he gasped for air and shouted that he couldn’t breathe. 

Alyssa Funari, who was 17 when she encountered the deadly arrest, testified Friday at the federal civil rights trial for former Minneapolis Police Officers J. Alexander Kueng, Thomas Lane and Tou Thao. 

The officers are charged with violating Floyd's civil rights while acting under government authority. All three are accused of depriving Floyd, 46, of medical care while he was handcuffed and facedown as Officer Derek Chauvin pressed his knee onto Floyd's neck for nine and a half minutes. Kueng knelt on Floyd’s back and Lane held down his legs while Thao kept bystanders back, officials have alleged. 

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FILE - This combination of photos provided by the Hennepin County Sheriff's Office in Minnesota on  June 3, 2020, shows, from left, former Minneapolis police officers J. Alexander Kueng, Thomas Lane and Tou Thao. 

FILE - This combination of photos provided by the Hennepin County Sheriff's Office in Minnesota on  June 3, 2020, shows, from left, former Minneapolis police officers J. Alexander Kueng, Thomas Lane and Tou Thao.  (Hennepin County Sheriff's Office via AP, File)

Kueng and Thao are also accused of failing to intervene to stop the May 25, 2020, killing, which triggered protests worldwide and a reexamination of racism and policing.

Kueng, who is Black, Lane, who is White, and Thao, who is Hmong American, are charged with willfully depriving Floyd of his constitutional rights while acting under government authority. The charges allege that the officers’ actions resulted in Floyd’s death.

Also Friday, prosecutors showed snippets of bystander and police video with timelines and transcripts put together by Matthew Vogel, an FBI special agent who described what was being shown. The materials explain the sequence of events and show jurors exactly who said and did what and when.

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Earlier in the day, Funari, now 19, testified that she lived about a mile from the intersection where Floyd was killed and went up to the corner store to get a phone charger. She drove past and saw three officers on top of a man in the street. She said she parked her car, left it running, got out and started recording because she had a "gut feeling" something was wrong.

In this image from a police body camera, bystanders including Alyssa Funari, left filming, Charles McMillan, center left in light colored shorts, Christopher Martin center in gray, Donald Williams, center in black, Genevieve Hansen, fourth from right filming, Darnella Frazier, third from right filming, witness as then Minneapolis police officer Derek Chauvin pressed his knee on George Floyd's neck for several minutes, killing Floyd on May 25, 2020, in Minneapolis.

In this image from a police body camera, bystanders including Alyssa Funari, left filming, Charles McMillan, center left in light colored shorts, Christopher Martin center in gray, Donald Williams, center in black, Genevieve Hansen, fourth from right filming, Darnella Frazier, third from right filming, witness as then Minneapolis police officer Derek Chauvin pressed his knee on George Floyd's neck for several minutes, killing Floyd on May 25, 2020, in Minneapolis. (Minneapolis Police Department via AP, File)

She said she heard screaming and yelling. 

"I instantly knew that he was in distress. ... He was moving, making facial expressions that he was in pain," she said. "He was telling us that he was in pain."

One of the prosecution's key arguments has been that the officers were trained to provide medical aid in emergencies, and that Floyd's situation had become so serious as police held him down that even bystanders, including children with no medical training, knew something was wrong.

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Prosecutors played videos recorded by Funari, which show Floyd eventually growing quiet and motionless. Funari yells at officers that Floyd isn't moving.

In this image from police body camera video shown as evidence in court, paramedics arrive as Minneapolis police officers, including Derick Chauvin, second from left, and J. Alexander Kueng restrain George Floyd in Minneapolis, on May 25, 2020. 

In this image from police body camera video shown as evidence in court, paramedics arrive as Minneapolis police officers, including Derick Chauvin, second from left, and J. Alexander Kueng restrain George Floyd in Minneapolis, on May 25, 2020.  (Minneapolis Police Department via AP, File)

"I observed that over time he was slowly being less vocal and he was closing his eyes," she testified. "He wasn’t able to tell us that he was in pain anymore. He was just accepting it."

Funari said she did not see Thao provide any medical assistance to Floyd. She testified that she saw Kueng check Floyd's pulse twice. When prosecutor Manda Sertich tried to ask if Funari saw Lane provide medical aid, she was met with an objection.

On cross-examination, Thao's attorney, Robert Paule, said Thao was closer to the crowd and that at times, the officers and Floyd were behind him. Paule said Thao was mostly watching the bystanders, whom Funari said were getting "more desperate," and was trying to keep them on the curb.

He asked Funari if there was a chance Thao didn’t know what was going on behind him. Funari said, "No ... you could hear it."

Newly released body-camera footage captures the growing horror of onlookers who repeatedly pleaded with police to get off George Floyd.

Newly released body-camera footage captures the growing horror of onlookers who repeatedly pleaded with police to get off George Floyd. (Associated Press/Minneapolis Police Department)

Funari said she believed the crowd was calm after the ambulance arrived and that Thao "was just standing there."

Earlier Friday, the chair of the Minnesota agency that sets licensing standards for police officers testified that the three officers would have received training about constitutional rights and on providing first aid. Kelly McCarthy, chief of police in Mendota Heights and chair of Minnesota Police Officers Standards and Training, described training that every officer in the state must receive.

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She said officers are specifically taught to reposition someone who is restrained facedown, to ensure they can breathe. Asked why, she said, "There were enough in-custody deaths that we needed to have a learning objective on it."

Fox News' Mills Hayes contributed to this report, as well as The Associated Press.