Based on the video, the officer to the left was not a shooter, but was using a taser. I say this for four reasons:
(1) He has the weapon in his left hand in a single handed grip, and I see no evidence of recoil in that left hand;
(2) He reaches with his right hand for his right hip while using the weapon in his left hand. This movement only makes sense if he is reaching for a pistol for the event that his less lethal weapon is ineffective;
(3) He would not have a safe shot. Police are not known as the best shots, and his line of fire would have exposed the entire roadblock to his fire; and
(4) It appears as if you can see this officer stripping (like in fly-fishing) wire from the taser as he walks around Lavoy.
I don't think anyone at the roadblock shot Finnicum. Going back to point (3) above, none of the police at the roadblock would have had a safe line of fire because of the position of the officer in the upper left.
The only shooter was likely the officer in the lower center as he was the only officer with a safe line of fire.
With this said, it seems that the officer in the center shot much earlier than the officer with the taser, and it seems likely that Lavoy was reacting to the impact of bullets when he went for his side.
Overall, this isn't open and shut and the video doesn't resolve doubt as to whether Lavoy was murdered or justifiably killed by the officers at the roadblock.
The other issue that needs to be raised is that the entire action was based on a trumped-up charge. In this case, the violated law was a 150 year old law that is broken by every protest. (i.e. it is hard to think of a scenario when a protest doesn't impede at least one postal worker; alternatively, there is no way that at least one SEC employee wasn't impeded or intimidated by OWS). The spotty and inconsistent enforcement of this law potentially raises due process concerns and shows that this arrest was merely a political arrest, likely because the MWR protesters did not align with the current regime's goals and beliefs.
The political nature of the arrest and the ridiculous nature of the charge supporting the arrest makes this, regardless of whether the police were justified in pulling the trigger, murder by the regime. (we haven't even touched on whether Lavoy would have been justified if he had shot the police based on two eyewitness statements that the FBI shot at the truck at the initial stop, and based on the fact that Ryan Bundy was, somehow, shot in the arm).
I keep seeing people posting that "no one was even near him", 50 feet was the closest, "no one near enough to use a Taser" etc.
The guy looks like an 19th century Sioux Indian counting coup.