A safety volunteer accused of fatally shooting a man taking part in a “No Kings” protest last June in Salt Lake City while firing at another man he believed to be a potential mass shooter has been charged with manslaughter, prosecutors announced Wednesday. Matthew Alder allegedly fired three shots — one hitting a man who had been seen assembling an AR-15 rifle near the crowd and a third inadvertently killing the rally participant, Arthur Folasa Ah Loo , according to Salt Lake County District