Hopefully the autopsy report, not yet completed, will shed some light on the actual cause of death.
As bad as the cop's actions are, if they did not actually cause the death, it's not murder. Causation is an essential element of homicide.
On another note, the only time black lives matter is when whites or cops are implicated and the incident can be used to incite racially motivated hatred of white people and looting. Blacks kill each other every day and there's no protest because there's no profit in dealing with the fact that most blacks have no respect for any norm of civilized behavior.
Where I live in Southern California, Black Lives Matters went out and blocked a freeway. What does this have to do with anything that happened in Minneapolis? Nothing. It's an excuse for black savages to make life **** for people and get away with it. Only when blacks can show their contempt for civilization to they get up off the couch and do something worthwhile.
More and more I'm beginning to understand the role of lynching in the old south. It worked.