I wouldn't bet on that. The shoot was completely contrary to everything the cops would have been taught in training, as well as whatever LE training he might have gotten while with the Coasties. Unless the jury just gives him a huge undeserved break, like the first Rodney King jury did, it's a pretty clear 2nd degree murder case. The defense may give up on arguing for innocence, and argue for manslaughter, but given all the weight of training to the contrary, the taser drop, and lying about the CPR, there's a pretty good chance the jury won't be having it.
No argument from me about the departure from training and the taser drop -- that's tampering with evidence and all cops are routinely and explicitly trained, I would think, not to do that kind of thing.
Devil's in the details, I guess, and those all-important mitigating circumstances. Only question is whether the defense attorneys do well in presenting those and, of course, whether the jury buys them or not.
In any event, we'll have no Wilson-like case here.