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Pulmonologist's Testimony Could Prove Devastating For Derek Chauvin's Defense Team

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CBS4's Michael George has more on day nine of the Derek Chauvin murder trial.

Video Transcript

MARTIN TOBIN: Mr. Floyd died from a low level of oxygen.

ELIOTT RODRIGUEZ: All right, right now at 5:00, compelling testimony for the prosecution for day nine of the Derek Chauvin murder trial, a pulmonologist whose testimony could prove devastating for the defense. The state's 31st witness testified Chauvin's two knees on George Floyd's back and neck for more than nine minutes made it impossible for George Floyd to take in enough oxygen to sustain life.

CBS' Michael George has more.

- The testimony you're about to give will be the truth and nothing but the truth.

MARTIN TOBIN: I do.

MICHAEL GEORGE: Dr. Martin Tobin broke down moment by moment the last minutes of George Floyd's life.

MARTIN TOBIN: The last breath he took was at 20, 25, 16. Then we know after that, he stayed on the street for another three minutes or so.

MICHAEL GEORGE: Using photos, diagrams and a computer rendering of Floyd's arrest, the pulmonologist and critical care specialist testified Derek Chauvin's knees and at times full weight were on Floyd's body.

MARTIN TOBIN: Officer Chauvin's left knee is virtually on the neck for the vast majority of the time.

- And when you say vast majority, are you able to be more--

MARTIN TOBIN: It's more than 90% of the time in my calculations.

MICHAEL GEORGE: The doctor testified those actions nearly completely closed a portion of Floyd's airway and crushed his lungs, making it impossible for him to get enough oxygen.

MARTIN TOBIN: At that point, there's not an ounce of oxygen left in his body.

MICHAEL GEORGE: He says after about five minutes, Floyd suffered brain damage.

MARTIN TOBIN: A healthy person subjected to what Mr Floyd was subjected to would have died.

MICHAEL GEORGE: Tobin also said video proves Floyd was breathing normally before he died, and fentanyl would have slowed his breathing rate down significantly. Chauvin's defense has tried repeatedly to claim Floyd died from underlying health issues and illegal drug use.

Forensic scientist testified Wednesday that pill fragments found in Floyd's car contained methamphetamine and fentanyl. The defense also played this audio for witnesses several times. Chauvin's defense suggested Floyd said, "I ate too many drugs." but the witnesses did not agree.

Michael George, CBS News.