I think this should be prosecuted as murder, or as homicide with so many aggravating factors it makes little difference when it comes to sentencing.
Body-cam footage shows arrest earlier in April by police in Alameda of Mario Gonzalez, 26, which ended in his death
www.theguardian.com
Once they had him handcuffed, he was sufficiently restrained and subdued that they longer needed to use any force at all on him, and certainly didn't need to keep on kneeling on his neck for five minutes (guess they haven't been keeping up with the news).
They should have allowed him to stand, or at least, sit, while summoning medical assistance prior to taking him into custody (which they should have done far earlier).
That's what they're supposed to do here, anyway, and I can't imagine what legal excuse there could be in the US for they way they treated this poor man.