George Floyd died from a lack of oxygen during his arrest, a doctor at the trial of ex-police officer Derek Chauvin in Minneapolis has said.
Contradicting the defence, Dr Martin Tobin said fentanyl did not cause Mr Floyd’s death. He said even a “healthy person…would have died”.
Mr Chauvin, 45, was filmed kneeling on Mr Floyd’s neck for more than nine minutes during his arrest last May.
The ex-officer is on trial for murder and has denied the charges against him.
The footage of Mr Chauvin, who is white, with his knee on African-American Mr Floyd’s neck sparked global protests against racism.
The trial is in its second week and is expected to last for at least one month. The defence is due to begin arguing its case in court next week.
What did the experts say about fentanyl?
Meanwhile, forensic toxicologist Daniel Isenschmid, whose laboratory tested Mr Floyd’s blood and urine samples following his death, said there was evidence that some of the fentanyl had metabolised, meaning that an overdose was less likely.
Dr Smock also told the court that while viewing the footage, he heard Mr Floyd complain about being unable to breathe before he was restrained on the ground.