Accident....is an unforeseen event. Careless or negligent handling is not an accident. That would be like saying that if a driver was DUI and ran over someone, that is an "accident". No, it is not. Accident is usually attribute to a honest mistake. Having your finger on a trigger of a gun and not even knowing that it was loaded.....is not a honest mistake.  So the proper wording should be....."Mr. Lock carelessly/negligently discharged a firearm that resulted in a life threatening injury to his neighbor upstairs!" Considering that he was liquored up and smoking pot, that is really a no brainer!! "Accident" is one of the most misused words in journalism.