MINNEAPOLIS — George Floyd died of a lack of oxygen from being pinned on his stomach with his hands cuffed behind him and his face jammed against the pavement, a medical expert testified Thursday at former Officer Derek Chauvin's murder trial.


What You Need To Know

  • A lung and critical care specialist testified at the Derek Chauvin trial Thursday that George Floyd died of a lack of oxygen from being pinned on his stomach with his hands cuffed behind him and his face jammed against the pavement

  • Dr. Martin Tobin cited several factors that he said had made it difficult for Floyd to breathe, beyond Chauvin’s knee on his neck: officers lifting up on his handcuffs, the hard street, his prone position, his turned head, and a knee on his back

  • The defense has argued that illegal drug use and underlying health conditions were to blame for Floyd's death, not Chauvin's knee in his neck

  • Chauvin, 45, is charged with murder and manslaughter in Floyd’s death May 25

Floyd's breathing while he was being held down by Chauvin and two other officers was too shallow to take in enough oxygen, which in turn damaged his brain and caused his heart to stop, said Dr. Martin Tobin, a lung and critical care specialist at the Edward Hines, Jr. VA Hospital and Loyola University's medical school in Chicago.

Tobin was called to testify as part of an effort by prosecutors to establish that it was Chauvin's actions — not Floyd's illegal drug use and underlying health conditions, as the defense contends — that killed the 46-year-old Black man last May.

Tobin took direct aim at the defense theory, declaring: “A healthy person subjected to what Mr. Floyd was subjected to would have died as a result of what he was subjected to."

Chauvin kept his knee on Floyd’s neck for 3 minutes, 2 seconds, after Floyd had “reached the point where there was not one ounce of oxygen left in the body,” Tobin said.

The witness cited several factors that he said had made it difficult for Floyd to breathe, beyond Chauvin’s knee on his neck: officers lifting up on his handcuffs, the hard street, his prone position, his turned head, and a knee on his back.

Tobin, analyzing a graphic presentation of the three officers pinning Floyd for what prosecutors say was almost 9 1/2 minutes, said Chauvin’s knee was “virtually on the neck for the vast majority of time.” He said it was “more than 90% of the time in my calculations.”

He said it appeared that Floyd was getting enough oxygen for about the first five minutes to keep his brain alive because he was still speaking.

But Tobin said where Chauvin had his knee after the five-minute mark would not make much of a difference, because at that point, Floyd had already experienced brain damage.

Chauvin attorney Eric Nelson has repeatedly shown the jury still images from the video that he said showed Chauvin's knee was on Floyd's shoulder blade. But nearly all of those images were captured more than five minutes into the ordeal, according to video time stamps.

Tobin explained to jurors what happens as the space in the airway narrows, saying breathing then becomes “enormously more difficult,” like "breathing through a drinking straw.”

Tobin testified that if the hypopharynx – the bottom part of the throat -- becomes totally obstructed, it takes just seconds to reduce the level of oxygen to where it would result “in either a seizure or a heart attack.”

Prosecutors showed images of Floyd side by side, one with the front of his face pressed against the pavement and another with his head turned. Tobin said that when Floyd’s head was facedown, a ligament at the back of his neck would have protected his airway. But with his head turned, Chauvin’s weight would have compressed the hypopharynx.

The expert calculated that at times when Chauvin was in a near-vertical position, with his toes off the ground, half of Chauvin’s body weight -- 91.5 pounds -- was directly on Floyd’s neck.

Tobin used simple language, with terms like “pump handle” and “bucket handle” to describe the act of breathing for jurors. At one point, he invited them to “examine your own necks, all of you in the jury right now” to better understand the effect of a knee on a person’s neck.

Most of the jurors felt their necks as Tobin instructed, though the judge later told them they didn't have to do so.

Another prosecution witness, Dr. Bill Smock, an expert on deaths from asphyxia, backed up Tobin’s assessment. Smock said Floyd did not have symptoms of a fentanyl overdose such as constricted pupils and decreased breathing. He said Floyd’s actions were the opposite, because he was pleading for air.

“That is not a fentanyl overdose. That is somebody begging to breathe,” said Smock, the police surgeon for the Louisville, Kentucky, department. He said Floyd died of “positional asphyxia,” a lack of oxygen because of the position of the body.

Also Thursday, a forensic toxicologist said that he tested blood drawn from Floyd at the hospital, as well as urine from his autopsy, and found a “very low” amount of methamphetamine. Daniel Isenschmid said fentanyl and a byproduct of its breakdown also were in Floyd’s system.

Isenschmid put the level of fentanyl in Floyd’s blood at 11 nanograms per milliliter. For perspective, he said that testing of more than 2,000 people arrested for driving under the influence of fentanyl revealed an average concentration of 9.59, and dozens of them had levels higher than Floyd’s -- and lived.

On cross-examination, Nelson suggested there was no way to know how much fentanyl Floyd had ingested, and Isenschmid agreed. The defense attorney also said it’s impossible to know the concentration of fentanyl in illegal street drugs.

“Every single pill you take, it becomes a unique experience for the person, right?” Isenschmid agreed.

Chauvin, 45, is charged with murder and manslaughter in Floyd’s death May 25. Floyd was arrested outside a neighborhood market after being accused of trying to pass a counterfeit $20 bill. A panicky-sounding Floyd struggled and claimed to be claustrophobic as police tried to put him in a squad car, and they pinned him to the pavement.

Bystander video of Floyd crying that he couldn’t breathe as onlookers yelled at Chauvin to get off him sparked protests and scattered violence around the U.S.

Nelson has argued that the now-fired white officer “did exactly what he had been trained to do over his 19-year career,” and he has disputed that Chauvin’s actions were what killed Floyd. Fentanyl and methamphetamine were found in Floyd’s system.