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"I can state with a high degree of medical certainty that George Floyd did not die from a primary cardiac event and he did not die from a drug overdose," cardiologist Dr. Jonathan Rich says.
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Hennepin County Medical Examiner Dr. Andrew Baker testified Friday that Floyd's subdual and neck compression by police was more than his body could handle, given his underlying heart conditions.
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Senior Special Agent James Reyerson changed his own testimony on Wednesday, after first saying Floyd admitted, "I ate too many drugs." The reversal was a blow for defendant Derek Chauvin.
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The officers could have taken other measures, including simply talking to George Floyd, says Sgt. Jody Stiger, a use-of-force expert at the Los Angeles Police Department.
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"Just because [someone is] speaking does not mean they are breathing adequately," Minneapolis police medical support coordinator Nicole Mackenzie testified.
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Lt. Johnny Mercil and Sgt. Ker Yang are the latest in a string of police officials who are testifying about the department's training and Derek Chauvin's use of force against George Floyd.
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"To continue to apply that level of force to a person proned out, handcuffed behind their back – that in no way, shape or form is anything that is by policy," said Chief Medaria Arradondo.
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Asked if he saw anything on police body camera footage that would justify putting a knee on George Floyd's neck for more than nine minutes, Lt. Richard Zimmerman said, "No, I did not."
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"When Mr. Floyd was no longer offering up any resistance to the officers, they could have ended the restraint," retired Sgt. David Ploeger told the court on Thursday.
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Video footage played in court on Tuesday shows Genevieve Hansen pleading with officers on top of George Floyd for a chance to help him. She asked them to check his pulse.
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Two key questions are at play in Derek Chauvin's murder trial: What killed George Floyd, and did Chauvin use excessive force? Civil rights lawyer Charles Coleman Jr. discusses the early takeaways.
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Opening arguments and witness testimony on the killing of George Floyd began 10 months after videos of his death sparked outrage and protests against racial inequality.