Friday marked the end of the first week of witness testimony in the high-profile trial of Derek Chauvin , the former Minneapolis police officer charged with murder and manslaughter in George Floyd s death.

Multiple witnesses became emotional as they recounted Chauvin, who is white, kneeling on Floyds neck on May 25, 2020, as Floyd, who is Black, repeatedly stated that he couldnt breathe and cried out for Mama.

Chauvin has been charged with second- and third-degree murder as well as second-degree manslaughter. He has pleaded not guilty to all charges.

Here were the biggest takeaways from this weeks proceedings:

Public Safety Officials Were Alarmed By Chauvins Actions

Several witnesses who took the stand this week were public safety officials, including Genevieve Hansen, a Minneapolis firefighter who was off duty when she witnessed Floyds arrest.

Hansen testified that Officer Tou Thao blocked her from providing medical assistance to Floyd after she identified herself as a Minneapolis firefighter. (Hansen said she was not wearing her uniform at the time, nor did she present Thao with any identification.)

She can be heard in bystanders video repeatedly telling Thao and Chauvin to check Floyds pulse and that the man needed help.

After paramedics loaded Floyds body onto an ambulance, about nine minutes after Chauvin began kneeling on his neck, Hansen called 911. The prosecution played a portion of the call in which Hansen can be heard telling the dispatcher that the police fucking killed Floyd.

I literally watched police officers not take a pulse and not do anything to save a man, Hansen, 27, told the dispatcher.

On Monday, prosecutors called to the stand Jena Scurry, a 911 dispatcher who reported Chauvins and the other officers actions to her supervisor after witnessing Floyds arrest on a surveillance camera.

Scurry had dispatched police to the Cup Foods store that night when a worker reported someone later determined to be Floyd had used a $20 bill suspected of being counterfeit.

Scurry said she watched officers restrain Floyd for so long on the camera footage that she wondered if the screens had frozen. She then called the supervising sergeant to let him know that something seemed off.

My instincts were telling me that somethings wrong, Scurry testified. Something wasnt right.

Bystanders Feel Guilt, Sorrow Over Floyds Death

Several people who witnessed Floyds arrest, including multiple teenagers , became emotional as they testified about his death and said they wish they could have done more to help him.

Darnella Frazier, 18, recorded a video of the arrest that was viewed millions of times around the world. She said Tuesday that she stays up some nights apologizing and apologizing to Floyd for not saving his life.

Alyssa Funari, who was 17 at the time of Floyds arrest, also testified Tuesday. She became tearful at times, stating that it was difficult for her to talk about that night.

No Reason For Police Not To Initiate Chest Compressions

Derek Smith, one of the paramedics who took Floyd to the hospital, testified Thursday that Floyd appeared to be dead when he arrived at the scene. Smith said Chauvin was still kneeling on Floyds neck when he checked it for a pulse. He didnt find one.

Officer Thomas Lane, one of the first officers to respond to the initial 911 call made by the Cup Foods worker, went in the ambulance and helped the paramedics with resuscitation efforts as they drove a few blocks away from the scene, Smith said.

Smith instructed Lane to begin chest compressions on Floyd and Lane complied, Smith testified . Lane left the ambulance after firefighters arrived and began assisting the paramedics.

During his cross-examination of Smith, defense attorney Eric Nelson asked him why he didnt have Lane continue to help with resuscitation efforts, appearing to suggest that Lane and other officers didnt have the proper training to render medical aid.

Is it because hes not an EMT? Nelson asked.

Any layperson can do chest compressions, Smith responded. Theres no reason [the police] couldnt have started chest compressions.

Bystanders in videos of Floyds arrest could be heard imploring the officers to get off of Floyd and help him. But the officers continued to pin Floyd to the pavement, even after he stopped speaking and moving, until the paramedics arrived.

Chauvins Actions Totally Unnecessary, Police Lt. Testifies

Minneapolis Police Lt. Richard Zimmerman, the longest-serving police officer in the department, testified Friday that Chauvins actions were totally unnecessary.

Pulling him down to the ground facedown and putting the knee on the neck for that amount of time is just uncalled for, said Zimmerman, who helped secure the area of the arrest hours after Floyd was taken to the hospital.

If your knee is on a persons neck, that can kill him, Zimmerman later said.

Zimmerman said Minneapolis police officers are trained every other year or so in cardiopulmonary resuscitation, including instruction on how to perform chest compressions.

Officers need to provide medical care for a person that is in distress even if an ambulance has already been called, Zimmerman testified.

A day earlier, retired Minneapolis police Sgt. David Pleoger, Chauvins supervisor at the time of Floyds arrest, testified that he believed the officers could have stopped restraining Floyd so severely once Floyd had stopped resisting.

On Monday, eyewitness Donald Williams, who said hed trained for years as a mixed martial artist, said Chauvin had used a blood choke on Floyd when he knelt on him.

New Video Shows Chauvins Actions After Arrest

This week, the prosecution presented videos never before seen by the public that showed Floyds arrest from various perspectives and its aftermath.

In video recorded by Chauvins body camera, he can be seen returning to his squad car after the ambulance leaves.

Defense Strategy Revealed

Nelson, Chauvins attorney, outlined the defenses arguments in his opening statement Monday. He contended Floyds death was caused in part by a preexisting heart condition and a drug overdose not Chauvins actions.

The Hennepin County Medical Examiners Office released an autopsy report in June that said Floyds death was a homicide and that his cause of death was cardiopulmonary arrest complicating law enforcement subdual, restraint and neck compression. It also reported that Floyd had fentanyl and methamphetamine in his system when he died.

Courteney Ross, Floyds former girlfriend, became emotional as she testified about meeting Floyd a mamas boy for the first time and their subsequent three-year relationship. She also described how she and Floyd like millions of other Americans each year struggled with opioid addiction.

Its a classic story of how many people get addicted to opioids, Ross said. We both suffered from chronic pain. ... We both had prescriptions. ... We got addicted and tried really hard to break that addiction many times.

During cross-examination, Nelson asked Ross to discuss Floyds extended hospitalization in March 2020. She said she drove Floyd to the hospital one night because he complained of severe stomach pains. She noticed foam near his mouth while she was bringing him there.

She testified that she later learned Floyd was ill because he had overdosed.

Nelson has also tried to portray the crowd of bystanders as violent and unruly, which hed suggested made it more difficult for the officers to do their jobs. Though two paramedics who treated Floyd said the crowd was yelling and seemed upset, neither of them said they saw bystanders physically fighting.

Zimmerman testified, based on his viewing of both the bystander and body camera videos, that no one in the crowd appeared to be attacking the officers.

I saw no reason why the officers felt they were in danger, if thats what they felt, he said, and thats what they would have to have felt to have to use that kind of force.

The trial will resume Monday around 9 a.m. Central time. You can livestream it here .