A forensic pathologist for the defence of fired Minneapolis officer Derek Chauvin argues George Floyd’s death was caused by his pre-existing heart condition and carbon monoxide he inhaled from a police car. Floyd died in May last year after Chauvin kneeled on his neck. David Fowler, the Zimbabwean-born former Maryland chief medical examiner, who graduated from the University of Cape Town, says he considers the manner of death to be undetermined.