A lot of ppl think that a murder conviction may be unrealistic but if you look at statute law in Minnesota...
609.195 MURDER IN THE THIRD DEGREE.
(a) Whoever, without intent to effect the death of any person, causes the death of another by perpetrating an act eminently dangerous to others and evincing a depraved mind, without regard for human life, is guilty of murder in the third degree and may be sentenced to imprisonment for not more than 25 years.
(b) Whoever, without intent to cause death, proximately causes the death of a human being by, directly or indirectly, unlawfully selling, giving away, bartering, delivering, exchanging, distributing, or administering a controlled substance classified in Schedule I or II, is guilty of murder in the third degree and may be sentenced to imprisonment for not more than 25 years or to payment of a fine of not more than $40,000, or both.
This is known as a depraved-indifference murder. If Chauvin committed the act knowing that it runs an unusually high risk of causing death OR serious bodily harm to a person, he would have the requisite mental state for committing 3rd degree murder. Serious bodily harm is enough. I don't think a more severe murder conviction can be secured though. Also a good chance it will reduce down to manslaughter.