The cop who yelled, he's got a gun, when it was in his holster and not his hand seems to be the biggest factor in causing the situation. Other than Alex Pretti just being there, which he had every right to do. So, once again a couple of cowboys cops murder an unarmed man. If this intensive care nurse had been black instead of white, half the country would be on fire, and the National Guard would be called out by now to stop the looting. Where's all the outrage when the cops kill a white man? Seriously.
I wouldn't be jumping on the "murder" bandwagon so quick. There are many charges that fall under the heading of a wrongful death.
Making the proclamation that there is a gun present is not wrong in any way. They were struggling with Pretti, an agent saw the gun, and he made sure everyone knew there was a gun present. Standard operating procedure.
Many will call this "victim blaming," but Pretti made the decision to answer a call to participate in agitation, he chose to carry a firearm to this event, he chose to insert himself in a situation that was none of his business (the dispute between the woman and the agent), he chose to keep his firearm a secret from the agents, and he became physical with the agents. Pretti set the stage for the final act, and I guarantee that nobody involved is happy with how the final act played out.