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A Minneapolis homicide lieutenant with over 40 years of experience said Friday that Derek Chauvin's use of force on George Floyd was "totally unnecessary," testifying that "if your knee is on a person's neck, that can kill him."

Why it matters: Though his role is in investigation and not on patrol — something the defense emphasized — media commentators called it the most compelling testimony yet from law enforcement who have taken the stand at former Minneapolis police officer Derek Chauvin's murder trial.

Driving the news: The night of the incident, Richard Zimmerman was called to the scene where George Floyd died after Chauvin kneeled on his neck for over nine minutes. Having reviewed footage, he testified that Chauvin's use of force — which he considered "the top tier, the deadly force" — was "uncalled for."

  • Once a person is handcuffed, the threat level goes down "all the way" and officers are trained to use restraint, Zimmerman said.
  • The goal is to get people out of the prone position as soon as possible because it's dangerous, he added, noting that the handcuffs constrict a person's breathing because they "stretch the muscles through your chest."
  • If someone becomes less combative, an officer should try to calm them down, Zimmerman said. That person, their wellbeing and their safety become "your responsibility," he emphasized.

What they're saying: "Pulling him down to the ground face down, and putting your knee on a neck for that amount of time is just uncalled for," Zimmerman testified. "I saw no reason why the officers felt they were in danger if that's what they felt. And that's what they would have to have felt to be able to use that kind of force."

Between the lines: Several jurors started taking notes — more so than usual — during the line of questioning, NBC News reports.

The big picture: Zimmerman's testimony closed out the first week of what is expected to be a monthlong trial. Prosecutors are seeking Chauvin's conviction on murder and manslaughter charges.

  • A paramedic told the jury Thursday that when he arrived at the scene, he assumed "there was potentially some struggle still because [multiple officers] were still on top of him."

Recap of the week:

Go deeper

Paramedic says he saw officers "on top of" George Floyd as he arrived on scene

Screenshot: ABC News

The paramedic called to the scene of George Floyd's murder said Thursday "[multiple officers] were still on top" of Floyd as they arrived.

The state of play: The court heard earlier from Floyd's girlfriend, who described him as a kind man despite an ongoing struggle with opioid addiction. Following her testimony, a Hennepin County paramedic took the stand to detail the step-by-step events after former Minneapolis police officer Derek Chauvin kneeled on Floyd's neck for over nine minutes.

Chauvin could have stopped restraining Floyd sooner, ex-supervisor says

Derek Chauvin's former supervisor, retired police Sgt. David Pleoger, testified Thursday that officers could have stopped restraining George Floyd sooner.

The big picture: The testimony capped off the fourth day of the trial of former Minneapolis police officer Chauvin, who faces murder and manslaughter charges.

George Floyd's girlfriend recounts how they met, struggled with opioids

George Floyd's girlfriend, who was in a relationship with him when he died, was visibly distressed Thursday as she recounted her first encounter with Floyd and answered questions about their opioid use.

Why it matters: The prosecution and defense fought to sway jurors on Day 4 of former Minneapolis police officer Derek Chauvin's murder trial, casting Floyd as a devoted partner and a drug-addled drifter, respectively. Prosecutors are seeking Chauvin's conviction on murder and manslaughter charges.

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