What Did George Floyd Die From? Autopsy, Fentanyl, and Verdict

George Floyd died from cardiopulmonary arrest brought on by police restraint. The Hennepin County Medical Examiner ruled the death a homicide and recorded the cause as “cardiopulmonary arrest complicating law enforcement subdual, restraint, and neck compression.”¹ In plain terms, his heart and lungs stopped after Officer Derek Chauvin knelt on his neck for nine minutes and 29 seconds while two other officers helped hold him face-down on the pavement. Heart disease and fentanyl were present in his body and were listed as contributing conditions, but the medical examiner and every prosecution expert who testified at trial concluded they did not cause his death.

The Official Cause of Death

Hennepin County Chief Medical Examiner Dr. Andrew Baker performed the autopsy on May 26, 2020. He determined the cause of death was “cardiopulmonary arrest complicating law enforcement subdual, restraint, and neck compression,” and the manner of death was homicide.¹

“Cardiopulmonary arrest” means the heart and lungs stopped working. Baker later testified that this happened because the physical demands of being pinned prone with pressure on his neck were more than Floyd’s body could withstand. Adrenaline from the struggle drove his heart to beat faster, demanding oxygen it could no longer supply while he was held face-down and unable to breathe normally. “The law enforcement subdual, restraint and the neck compression was just more than Mr. Floyd could take, by virtue of those heart conditions,” Baker testified.²

The autopsy also listed three “other significant conditions”: arteriosclerotic and hypertensive heart disease, fentanyl intoxication, and recent methamphetamine use.¹ Baker was clear that these were contributing conditions, not the cause. Floyd’s enlarged heart and narrowed coronary arteries meant his heart needed more oxygen than an average person’s but had a reduced ability to deliver it. Under the stress of the restraint, that reserve ran out.

The Family’s Independent Autopsy

The Floyd family commissioned a second autopsy by Dr. Michael Baden, a well-known forensic pathologist, and Dr. Allecia Wilson of the University of Michigan. They concluded the cause of death was “homicide caused by asphyxia due to neck and back compression that led to a lack of blood flow to the brain.”³ The independent examiners found that pressure on the right side of Floyd’s carotid artery blocked blood flow to his brain while the weight on his back impaired his breathing.⁴

Both autopsies agreed the death was a homicide caused by the officers’ actions. The difference was in framing. The county report described a cardiac event brought on by the restraint. The independent report described mechanical asphyxiation more directly. Dr. Baden said Floyd had been in good health before the encounter; the official report gave more weight to his heart disease and drug use as contributing conditions.³

Did Fentanyl or Heart Disease Kill Him?

Floyd’s toxicology showed 11 nanograms per milliliter of fentanyl, 5.6 nanograms per milliliter of the fentanyl metabolite norfentanyl, and a low level of methamphetamine consistent with a prescription dose.⁵ Those numbers became the central defense argument at Chauvin’s trial: that Floyd died from drugs, not from being restrained.

The medical evidence pointed the other way. Forensic toxicologist Dr. Daniel Isenschmid testified that Floyd’s fentanyl level was significantly lower than the average seen in DUI suspects and far lower than the levels typically found in fatal overdoses.⁵ Forensic pathologist Dr. Lindsey Thomas ruled out a drug overdose entirely, testifying that Floyd’s death looked nothing like a fentanyl death, which is typically gradual, with the person becoming sleepy and quietly stopping breathing.⁶ Police surgeon Dr. William Smock said there was no evidence Floyd died of an overdose of any kind.

Baker did not change his findings under cross-examination. He agreed the heart disease and drugs played a role as contributing factors, then said plainly: “Mr. Floyd’s use of fentanyl did not cause the subdual or neck restraint. His heart disease did not cause the subdual or the neck restraint.”⁷

What the Restraint Did to His Body

The most detailed medical account came from Dr. Martin Tobin, a pulmonary and critical care specialist at Loyola University. Tobin concluded Floyd died from a critically low level of oxygen caused by the combination of being placed face-down, handcuffed behind his back, and having Chauvin’s knees on his neck and back. Chauvin’s knee narrowed Floyd’s hypopharynx, a critical passage for moving oxygen into the lungs. The resulting oxygen deprivation caused brain damage and a heart arrhythmia called pulseless electrical activity, which stopped Floyd’s heart.⁸

Tobin testified that Chauvin’s knee stayed on Floyd’s neck for three minutes and two seconds after Floyd took his last breath. “A healthy person subjected to what Mr. Floyd was subjected to would have died,” he told the jury.⁹ Dr. Thomas made the same point from a different angle: “There’s no evidence to suggest he would’ve died that night, except for the interactions with law enforcement.”⁶

Body-camera review put the total restraint at nine minutes and 29 seconds. Transcripts show Floyd said he could not breathe more than 20 times. About six minutes in, he became non-responsive. Officer J. Alexander Kueng checked for a pulse and could not find one. The officers did not move or begin aid.¹⁰

The Defense Theory and Why the Jury Rejected It

Chauvin’s defense called Dr. David Fowler, the former chief medical examiner of Maryland. Fowler testified that Floyd died of a sudden cardiac arrhythmia brought on by underlying heart disease and drug use, and that the manner of death should be classified as “undetermined” rather than homicide. He also suggested possible carbon monoxide exposure from a nearby police vehicle’s exhaust as a contributing factor.¹¹

On cross-examination, Fowler acknowledged that someone dying from oxygen deprivation would ultimately die of an arrhythmia as well, and he agreed that Floyd should have received immediate medical attention when he went into cardiac arrest, conceding “there still was a chance to save his life.”¹¹ More than 400 physicians later signed a letter calling his conclusions “outside the standard practice and conventions for investigating and certification of in-custody deaths.”¹²

On April 20, 2021, the jury convicted Chauvin on all three counts against him: unintentional second-degree murder, third-degree murder, and second-degree manslaughter.¹³ Every court that has since reviewed the case has left the conviction in place. The Minnesota Court of Appeals rejected Chauvin’s arguments in April 2023, the Minnesota Supreme Court denied further review in July 2023, and the U.S. Supreme Court declined to hear the case in November 2023.¹⁴

Claims That the Cause of Death Has Changed

Viral social media posts and some public figures have periodically claimed that new evidence proves Floyd died of a drug overdose or natural causes. These claims often cite a deposition from a prosecutor in a separate, unrelated employment lawsuit discussing early internal conversations about the case. The Hennepin County Medical Examiner’s Office has confirmed that no changes have been made to its findings. Dr. Baker’s autopsy report and trial testimony stand. The cause of death remains cardiopulmonary arrest complicating law enforcement subdual, restraint, and neck compression, and the manner of death remains homicide.¹⁵

1
Hennepin County. Hennepin County Medical Examiner Autopsy Report, Case 2020-3700
2
NPR. Medical Examiner Testifies About George Floyd’s Death
3
ABC News. Independent Autopsy Finds George Floyd Died of Asphyxiation
4
NPR. George Floyd Independent Autopsy: Homicide by Asphyxia
5
ABC News. Medical Witnesses Clash Over George Floyd’s Death
6
CNN. Derek Chauvin Trial Day 10
7
WTTW News. Heart Disease, Fentanyl Contributed to George Floyd’s Death but Were Not Main Cause
8
NPR. Medical Expert Says George Floyd Died From a Lack of Oxygen
9
PBS NewsHour. Floyd Died From Lack of Oxygen, Not Drugs, Medical Expert Testifies
10
BBC News. George Floyd: What Happened in the Final Moments of His Life
11
BBC News. Derek Chauvin Trial: Defence Expert Says Floyd’s Death ‘Undetermined’
12
NBC Washington. Maryland Reviews Ex-Official’s Work After Chauvin Testimony
13
NPR. Jury Reaches Verdict in Derek Chauvin’s Murder Trial
14
CNN. Supreme Court Rejects Derek Chauvin’s Appeal
15
FactCheck.org. No Change in George Floyd’s Cause of Death Despite Viral False Claims