Derek Chauvin has been arrested. More at the bottom of comments.

Update 1: Prosecutors warn there is 'evidence that does not support criminal charge' in case of four cops accused of killing George Floyd , dailymail.co.uk, May 29, 2020 (with 2 min. video from Mike Freeman's weasel words)
Other reports note that Freeman's 'office' later walked that position back for him..

"Prosecutors have warned there is ‘evidence that does not support criminal charges’ in the case of four cops accused of killing George Floyd, as they say police can use a ‘certain amount of force - but not excessive’.

At a press conference Thursday, Mike Freeman, county attorney for Hennepin County, condemned the actions of officer Derek Chauvin as 'horrific and terrible'. But he said prosecutors needed to determine if the white cop used 'excessive' force when he knelt on the black man's neck for eight minutes until he passed out and later died.