The only thing I would bring up to counter is that (IIRC, been a while since I watched the videos) Chauvin and others kept kneeling on him for an extra minute or two after he clearly lost consciousness. And Chauvin didn't bother to check for pulse or consciousness and even when the other officer did and said he found no pulse, he continued to kneel on his neck for a while longer.

I think at worst though that Chauvin is guilty of manslaughter due to negligent care rather than intentional murder.