This case is going to be a historical one. I do not disagree with you, an officer should be responsible for their actions but I think this case does not demonstrate negligence nor culpability. Yeah, there is no question the guy shouldn't have been killed but I think to prove she was negligent, they would have to prove that she did not follow training protocols. From the brief video, she followed protocols for a Taser deployment. Her belt was arranged consistent with what (most) agencies teach, and she fired just one time which, to me at least, indicates that she thought she was deploying a Taser. Of course, this is all just armchair QBing...there might be something else that is uncovered by other videos testimony.