Best case they can make is involentary manslaughter.

He followed his training, applying pressure to the back of a neck without pressure or an unmovable object to the front of the neck will not choke someone some else. At best you can argue it was manslaughter because he didn't use narcan. That is an incredibly hard case to prosecute.

The thing is though the mob here is already threatening possible jurors and people are afraid if they don't convict convict cop they will have their house burtn to the ground and be killed.