Stop Using The Word 'Worst' : MemmosStandards & Practices Editor Mark Memmott writes occasional notes about the issues journalists encounter and the way NPR handles them. They often expand on topics covered in the Ethics Handbook.
There are several reasons not to refer to the murders in Orlando as the "worst mass shooting in U.S. history." Editors have been pointed to Eyder's post about this, where those reasons are explored, but the phrase is still getting into stories. It's time to stop.
If a piece needs to put this tragedy in context, it can be said that it was the "deadliest" mass shooting in recent history.