MINNEAPOLIS (AP) — George Floyd‘s family on Wednesday demanded the arrest of all four police officers involved in his death, as they visited a makeshift shrine at the Minneapolis street corner where the black man died after a white officer pressed a knee on his neck as he pleaded for air.

Family attorney Ben Crump repeated his call for all four officers to be charged in Floyd’s death.

Crump said the other officers — two who helped restrain Floyd and one standing by — failed to protect a man who pleaded for help and said he couldn’t breathe.

Minnesota Gov. Tim Walz said on a National Governors Association call that state Attorney General Keith Ellison, now leading prosecutions in the Floyd case, would make an announcement later Wednesday on the other officers.

Crump and the Floyd family commissioned a separate autopsy that concluded he died of asphyxiation due to neck and back compression due to Chauvin’s knee on his neck and other responding officers’ knees in his back, which made it impossible for him to breathe.