A doctor has emphatically rejected claims that George Floyd's drug use and underlying health problems caused his death.
Lung and critical care specialist, Dr Martin Tobin, testified that Floyd died from a lack of oxygen while being pinned to the pavement with a knee on his neck.
The trial of former police officer Derek Chauvin was shown animations of him and two other officers holding Floyd down during the arrest.
Al Jazeera's Alan Fisher reports from Minneapolis, Minnesota.
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