An unarmed black man died in New York state after he was hooded by police and held face down to the road for two minutes, body camera footage shows.
Daniel Prude, 41, was suffering from mental health issues when police restrained him in March and put a “spit hood” on his head, designed to protect officers from a detainee’s saliva.
He later died of asphyxiation but his story has only now been made public.
His death was two months before the killing of George Floyd.
Mr Floyd died in May after a white policeman knelt on his neck for nearly eight minutes in Minnesota. Global anti-racism protests were held in the wake of his killing.
Tensions have risen again in the US in recent weeks after black man Jacob Blake was shot seven times in the back and paralysed during an arrest in Kenosha, Wisconsin, on 23 August, sparking large protests in the city that have turned violent.