To prove the other officers aided and abetted Floyd’s murder, they’ll have to prove the officers knew Chauvin was murdering Floyd and helped him succeed.
Chauvin will argue that even if he got carried away in the heat of the moment and intended to hurt Floyd, he didn’t intentionally kill him.
His actions were gruesome and the sheer amount of time he choked Floyd can support an inference of intent to kill.
The ability of prosecutors to obtain a conviction for 2nd degree murder (rather than 3rd) will depend on the other evidence they’ve gathered.
It’s possible they aided him later by making false statements verbally or in police reports.
No matter what, obtaining convictions of the officers won’t be easy. Hopefully this case sparks needed reform.
That will be easier to prove that proving that he intentionally killed Floyd.