So you will have to prove both felony assault with excessive force while the neck kneel was sanctioned by the MPD. Along with that, you'll need to prove that this directly caused the death of the man in spite of the autopsy report.
https://www.washingtonexaminer.com/opinion/what-a-second-degree-murder-charge-means-for-derek-chauvin
It is a large burden to prove beyond a reasonable doubt.